Dravite
A valid IMA mineral species - grandfathered
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About Dravite
Formula:
NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Colour:
Pale brown to dark-brown to brownish-black, also dark-yellow, blue, green.
Lustre:
Vitreous, Resinous
Hardness:
7
Specific Gravity:
3.03 - 3.18
Crystal System:
Trigonal
Member of:
Name:
Named in 1883 by Gustav Tschermak for the river Drau (in Latin, Drave), on which the type locality is situated.
Type Locality:
A very common member of the Tourmaline Group.
Dravite-Elbaite Series, Dravite-Schorl Series.
The Mg analogue of schorl.
The OH analogue of fluor-dravite. Compare oxy-dravite.
Green-to-red color change in Cr-bearing dravite is caused by the Usambara effect (see tourmaline for details), which is similar to the alexandrite effect.
Dravite from Syros, Greece, is the first example of Mg-rich tourmaline with significant admixture of tetrahedral boron (beside the dominant triangular-coordination form). The one from a pegmatite at Forshammar, Sweden, has the highest amount of REE for a pegmatitic tourmaline, although this is still a trace amount (โค 1200 ppm).
Visit gemdat.org for gemological information about Dravite.
Dravite-Elbaite Series, Dravite-Schorl Series.
The Mg analogue of schorl.
The OH analogue of fluor-dravite. Compare oxy-dravite.
Green-to-red color change in Cr-bearing dravite is caused by the Usambara effect (see tourmaline for details), which is similar to the alexandrite effect.
Dravite from Syros, Greece, is the first example of Mg-rich tourmaline with significant admixture of tetrahedral boron (beside the dominant triangular-coordination form). The one from a pegmatite at Forshammar, Sweden, has the highest amount of REE for a pegmatitic tourmaline, although this is still a trace amount (โค 1200 ppm).
Visit gemdat.org for gemological information about Dravite.Unique Identifiers
Mindat ID:
1318
Long-form identifier:
mindat:1:1:1318:1
Similar Names
IMA Classification of Dravite
Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
NaMg3Al6(Si6O18)(BO3)3(OH)3OH
Classification of Dravite
9.CK.05
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
9 : SILICATES (Germanates)
C : Cyclosilicates
K : [Si6O18]12- 6-membered single rings, with insular complex anions
Dana 7th ed.:
61.3.1.11
61.3.1.9
61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
61 : CYCLOSILICATES Six-Membered Rings
3 : Six-Membered Rings with borate groups
17.5.27
17 : Silicates Containing other Anions
5 : Borosilicates
17 : Silicates Containing other Anions
5 : Borosilicates
Mineral Symbols
As of 2021 there are now IMAโCNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMAโCNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMAโCNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Drv | IMAโCNMNC | Warr, L.N. (2021). IMAโCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Drv | Kretz (1983) | Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277โ279. |
| Drv | Siivolam & Schmid (2007) | Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download |
| Drv | Whitney & Evans (2010) | Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185โ187 doi:10.2138/am.2010.3371 |
| Drv | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Pronunciation of Dravite
Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of Dravite
Vitreous, Resinous
Transparency:
Transparent, Translucent
Colour:
Pale brown to dark-brown to brownish-black, also dark-yellow, blue, green.
Comment:
The results indicate that the tourmaline is dravite. Its UVโvis absorption spectrum shows strong broad absorption bands at approximately 436 and 600 nm, with a pronounced transmission at 520 nm, which directly accounts for its emerald green color. Obvious polarized absorption was observed along and perpendicular to the c-axis. XPS and PL results confirm that chromium is present in the samples in the form of Cr3+. EPMA compositional analysis indicated a low Cr2O3 content of 0.804 wt.%; combined with crystal structural properties and spectral responses, these results suggest that Cr3+ preferentially occupies the Y site in the crystal structure and that dโd electronic transitions represent the underlying mechanism of its color formation. This study comprehensively illustrated the mineralogical and spectral properties of Cr-bearing dravite.
Streak:
Light brown, rarely white.
Hardness:
7 on Mohs scale
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Very poor {1120} {1011}
Very poor {1120} {1011}
Fracture:
Irregular/Uneven, Conchoidal
Density:
3.03 - 3.18 g/cm3 (Measured) 3.038 g/cm3 (Calculated)
Optical Data of Dravite
Type:
Uniaxial (-)
RI values:
nω = 1.634 - 1.661 nε = 1.612 - 1.632
Max. Birefringence:
δ = 0.022 - 0.029
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 ยตm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 ยตm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Pleochroism:
Strong
Comments:
O= pale yellow
E= colorless, yellowish, greenish, brownish
E= colorless, yellowish, greenish, brownish
Chemistry of Dravite
Mindat Formula:
NaMg3Al6(Si6O18)(BO3)3(OH)3(OH)
Element Weights:
Common Impurities:
Fe,Mn,Ti,Ca,Cr,V,K,F
Crystallography of Dravite
Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 15.96(2) Å, c = 7.21(2) Å
Ratio:
a:c = 1 : 0.452
Unit Cell V:
1,590.49 ร
ยณ (Calculated from Unit Cell)
Z:
3
Morphology:
Equant to short to long prismatic
Twinning:
Rare, on {1011} and {4041}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020157 | Dravite | Vereshchagin O S, Rozhdestvenskaya I V, Frank-Kamenetskaya O V, Zolotarev A A (2014) Ion substitutions and structural adjustment in Cr-bearing tourmalines European Journal of Mineralogy 26 309-321 | 2014 | Umba Valley, Tanzania | 0 | 293 | |
| 0020156 | Dravite | Vereshchagin O S, Rozhdestvenskaya I V, Frank-Kamenetskaya O V, Zolotarev A A (2014) Ion substitutions and structural adjustment in Cr-bearing tourmalines European Journal of Mineralogy 26 309-321 | 2014 | Shabrovskoe ore district, Middle Urals, Russia | 0 | 293 | |
| 0020155 | Dravite | Vereshchagin O S, Rozhdestvenskaya I V, Frank-Kamenetskaya O V, Zolotarev A A (2014) Ion substitutions and structural adjustment in Cr-bearing tourmalines European Journal of Mineralogy 26 309-321 | 2014 | Shabrovskoe ore district, Middle Urals, Russia | 0 | 293 | |
| 0020154 | Dravite | Vereshchagin O S, Rozhdestvenskaya I V, Frank-Kamenetskaya O V, Zolotarev A A (2014) Ion substitutions and structural adjustment in Cr-bearing tourmalines European Journal of Mineralogy 26 309-321 | 2014 | Shabrovskoe ore district, Middle Urals, Russia | 0 | 293 | |
| 0019716 | Dravite | Bacik P, Uher P, Ertl A, Jonsson E, Nysten P, Kanicky V, Vaculovic T (2012) Zoned REE-enriched dravite from a granitic pegmatite in Forshammar Bergslagen Province, Sweden: An EMPA, XRD and LA-ICP-MS study The Canadian Mineralogist 50 825-841 | 2012 | Forshammar Bergslagen Province, Sweden | 0 | 293 | |
| 0018457 | Dravite | Hughes J M, Rakovan J, Ertl A, Rossman G R, Baksheev I, Bernhardt H-J (2011) Dissymmetrization in tourmaline: the atomic arrangement of sectorally zoned triclinic Ni-bearing dravite The Canadian Mineralogist 49 29-40 | 2011 | Berezovskoe gold deposit, Middle Urals, Russia | 0 | 293 | |
| 0004680 | Dravite | Bosi F (2008) Disordering of Fe2+ over octahedrally coordinated sites of tourmaline American Mineralogist 93 1647-1653 | ![]() | 2008 | Uto Island, south of Stockholm, Sweden | 0 | 293 |
| 0007080 | Dravite | Marschall H R, Ertl A, Hughes J M, McCammon C A (2004) Metamorphic Na- and OH-rich disordered dravite with tetrahedral boron, associated with omphacite, from Syros, Greece: chemistry and structure European Journal of Mineralogy 16 817-823 | 2004 | Syros, Greece | 0 | 293 | |
| 0007055 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Lake Baikal, Siberia | 0 | 293 | |
| 0007054 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Lake Baikal, Siberia | 0 | 293 | |
| 0007053 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Cruziero, Minas Gerais, Brazil | 0 | 293 | |
| 0007048 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Arendal, Norway | 0 | 293 | |
| 0007044 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Zillerthal, Tyrol, Austria | 0 | 293 | |
| 0007043 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Haddam, Connecticut, U.S.A. | 0 | 293 | |
| 0007042 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Haddam, Connecticut, U.S.A. | 0 | 293 | |
| 0007041 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Beresov Mine, Siberia | 0 | 293 | |
| 0007040 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Beresov Mine, Siberia | 0 | 293 | |
| 0007039 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Olkhon (Lake Baikal), Siberia | 0 | 293 | |
| 0007038 | Dravite | Bosi F, Lucchesi S (2004) Crystal chemistry of the schorl-dravite series European Journal of Mineralogy 16 335-344 | 2004 | Olkhon (Lake Baikal), Siberia | 0 | 293 | |
| 0002913 | Dravite | Camara F, Ottolini L, Hawthorne F C (2000) Crystal chemistry of three tourmalines by SREF, EMPA and SIMS American Mineralogist 87 1437-1442 | ![]() | 2000 | Madagascar | 0 | 293 |
| 0018792 | Dravite | Grice J D, Ercit T S (1993) Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Neues Jahrbuch fur Mineralogie, Abhandlungen 165 245-266 | 1993 | Yinnietharra, Western Australia | 0 | 293 | |
| 0018789 | Dravite | Grice J D, Ercit T S (1993) Ordering of Fe and Mg in the tourmaline crystal structure: The correct formula Neues Jahrbuch fur Mineralogie, Abhandlungen 165 245-266 | 1993 | Moctezuma, Sonora, Mexico | 0 | 293 | |
| 0001551 | Dravite | Hawthorne F C, MacDonald D J, Burns P C (1993) Reassignment of cation site occupancies in tourmaline: Al-Mg disorder in the crystal structure of dravite American Mineralogist 78 265-270 | ![]() | 1993 | Osarar, Narok District, Kenya | 0 | 293 |
| 0019011 | Dravite | Schmetzer K, Nuber B, Abraham K (1979) Zur Kristallchemie Magnesium-reicher Turmaline Neues Jahrbuch fur Mineralogie, Abhandlungen 136 93-112 | 1979 | Gerevi Hills, Tanzania | 0 | 293 | |
| 0000739 | Dravite | Foit F F, Rosenberg P E (1979) The structure of vanadium-bearing tourmaline and its implications regarding tourmaline solid solutions American Mineralogist 64 788-798 | ![]() | 1979 | Silver Knob, Mariposa County, California, USA | 0 | 293 |
| 0000045 | Dravite | Hamburger G E, Buerger M J (1948) The structure of tourmaline American Mineralogist 33 532-540 | ![]() | 1948 | de Kalb, New York, USA | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.576 ร | (100) |
| 3.99 ร | (85) |
| 2.961 ร | (85) |
| 4.22 ร | (65) |
| 3.48 ร | (60) |
| 2.040 ร | (45) |
| 1.920 ร | (35) |
Comments:
Dobrawa, Slovenia.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4a: Earthโs earliest continental crust | >4.4-3.0 |
| 19 : Granitic intrusive rocks | |
| Near-surface Processes | |
| 23 : Subaerial aqueous alteration by non-redox-sensitive fluids (see also #47) | |
| 26 : Hadean detrital minerals | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 34 : Complex granite pegmatites | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Geological Setting:
Metamorphosed limestones or mafic igneous rocks, rarely in pegmatites or authogenic overgrowths in sedimentary rocks.
Type Occurrence of Dravite
Place of Conservation of Type Material:
National Museum of Natural History, Washington, D.C., USA, R18133, R17274.
Synonyms of Dravite
Other Language Names for Dravite
Dutch:Draviet
Japanese:่ฆๅ้ปๆฐ็ณ
Russian:ะัะฐะฒะธั
Simplified Chinese:้็ตๆฐ็ณ
Spanish:Coronita
Dravita
Gouverneurita
Dravita
Gouverneurita
Traditional Chinese:้้ปๆฐฃ็ณ
Varieties of Dravite
| Chromium-bearing Dravite | A chrome-rich variety of Dravite. Cr may occupy both Y and Z sites. |
| Lime-Dravite | An end-member of the Tourmaline group |
| Soda-Dravite | A dravite with near endmember composition. |
Relationship of Dravite to other Species
Member of:
Other Members of Tourmaline:
| Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Alumino-oxy-rossmanite | โปAl3Al6(Si5AlO18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Celleriite | โป(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Chromium-dravite | NaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Chromo-alumino-povondraite | NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Darrellhenryite | Na(Al2Li)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Dutrowite | Na(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Ertlite | NaAl3Al6(Si4B2O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Ferro-bosiite | NaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Feruvite | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Fluor-buergerite | NaFe3+3Al6(Si6O18)(BO3)3O3F | Trig. 3m : R3m |
| Fluor-dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-rossmanite | โป(Al2Li)Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m(32/m) : R3m |
| Fluor-schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F | Trig. 3m : R3m |
| Foitite | โป(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Lucchesiite | CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Magnesio-dutrowite | Na(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Magnesio-foitite | โป(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Magnesio-lucchesiite | CaMg3Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Maruyamaite | K(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Olenite | NaAl3Al6(Si6O18)(BO3)3O3(OH) | Trig. 3m : R3m |
| Oxy-chromium-dravite | NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Oxy-dravite | Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Oxy-foitite | โป(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m(32/m) : R3m |
| Oxy-schorl | Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Oxy-vanadium-dravite | NaV3(V4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Princivalleite | Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Rossmanite | โป(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| 'UM2000-64-SiO:BFeHKMg' | (K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O | |
| 'UM2008-52-SiO:AlBCaFFeHLiMgNa' | (Ca,Na,โป)(Al,Li,Fe,Mg)3Al6[Si6O18](BO3)3(OH,O)3(F,O) | |
| 'Unnamed (F analogue of feruvite)' | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F | |
| 'Unnamed (Mn2+-F-analogue of foitite)' | โป(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3F ? | |
| 'Unnamed (Pb-analogue of Fluor-liddicoatite)' | Pb(Li2Al)Al6(Si6O18)(BO3)3(OH)3F | |
| Uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) | Trig. 3m : R3m |
| Vanadio-oxy-chromium-dravite | NaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
| Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O | Trig. 3m : R3m |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 165 photos of Dravite associated with Quartz | SiO2 |
| 55 photos of Dravite associated with Calcite | CaCO3 |
| 42 photos of Dravite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
| 42 photos of Dravite associated with Pyrite | FeS2 |
| 35 photos of Dravite associated with Dolomite | CaMg(CO3)2 |
| 33 photos of Dravite associated with Arsenopyrite | FeAsS |
| 31 photos of Dravite associated with Rutile | TiO2 |
| 28 photos of Dravite associated with Pyrrhotite | Fe1-xS |
| 25 photos of Dravite associated with Magnesite | MgCO3 |
| 19 photos of Dravite associated with 'Smoky Quartz' | SiO2 |
Related Minerals - Strunz-mindat Grouping
| 9.CK. | Adachiite | CaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH) |
| 9.CK. | Magnesio-dutrowite | Na(Mg2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Darrellhenryite | Na(Al2Li)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Fluor-schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK. | Princivalleite | Na(Mn2Al)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Alumino-oxy-rossmanite | โปAl3Al6(Si5AlO18)(BO3)3(OH)3O |
| 9.CK. | Dutrowite | Na(Fe2+2.5Ti0.5)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Ferro-bosiite | NaFe3+3(Al4Fe2+2)(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Bosiite | NaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK. | Celleriite | โป(Mn2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Feruvite | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Chromium-dravite | NaMg3Cr3+6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Fluor-rossmanite | โป(Al2Li)Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Oxy-schorl | Na(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Fluor-elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Foitite | โป(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Vanadio-oxy-dravite | NaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Fluor-buergerite | NaFe3+3Al6(Si6O18)(BO3)3O3F |
| 9.CK.05 | 'Unnamed (F analogue of feruvite)' | CaFe2+3(Al5Mg)(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Ertlite | NaAl3Al6(Si4B2O18)(BO3)3(OH)3O |
| 9.CK.05 | Tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Fluor-liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Elbaite | Na(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Fluor-tsilaisite | NaMn2+3Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Oxy-foitite | โป(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Liddicoatite | Ca(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Vanadio-oxy-chromium-dravite | NaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Rossmanite | โป(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Oxy-vanadium-dravite | NaV3(V4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Olenite | NaAl3Al6(Si6O18)(BO3)3O3(OH) |
| 9.CK.05 | 'UM2000-64-SiO:BFeHKMg' | (K,Na)Fe3+3(Mg2Fe3+4)Si6O18(BO3)3(OH)3O |
| 9.CK.05 | Magnesio-lucchesiite | CaMg3Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Povondraite | NaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Lucchesiite | CaFe2+3 Al6(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Chromo-alumino-povondraite | NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Fluor-dravite | NaMg3Al6(Si6O18)(BO3)3(OH)3F |
| 9.CK.05 | Oxy-dravite | Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | Oxy-chromium-dravite | NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O |
| 9.CK.05 | 'Luinaite-(OH)' | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Schorl | NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Magnesio-foitite | โป(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH) |
| 9.CK.05 | Maruyamaite | K(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O |
| 9.CK.10 | Abenakiite-(Ce) | Na26Ce6(Si6O18)(PO4)6(CO3)6(SO2)O |
| 9.CK.15 | Scawtite | Ca7(Si3O9)2CO3 ยท 2H2O |
| 9.CK.20 | Thorosteenstrupine | (Ca,Th,Mn)3Si4O11F ยท 6H2O |
| 9.CK.20 | Steenstrupine-(Ce) | Na14Mn2+2Fe3+2Ce6Zr(Si6O18)2(PO4)6(PO3OH)(OH)2 ยท 2H2O |
Fluorescence of Dravite
May weakly fluoresce under SW UV.
Other Information
Electrical:
Pyroelectric, piezoelectric.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Dravite
mindat.org URL:
https://www.mindat.org/min-1318.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Dravite
Reference List:
Agrell, S. O. (1941) Dravite-bearing rocks from Dinas Head, Cornwall. Mineralogical Magazine and Journal of the Mineralogical Society, 26 (174) 81-93 doi:10.1180/minmag.1941.026.174.02
Manning, P. G. (1969) An optical absorption study of the origin of colour and pleochroism in pink and brown tourmalines. The Canadian Mineralogist, 9 (5) 678-690
Dunn, Pete J. (1977) Chromium in dravite. Mineralogical Magazine, 41 (319) 408-410 doi:10.1180/minmag.1977.041.319.21
Hawthorne, Frank C., Macdonald, Daniel J., Burns, Peter C. (1993) Reassignment of cation site occupancies in tourmaline: Al-Mg disorder in the crystal structure of dravite. American Mineralogist, 78 (3-4) 265-270
Bloodaxe, Erich S., Hughes, John M., Dyar, M. Darby, Grew, Edward S., Guidotti, Charles V. (1999) Linking structure and chemistry in the schorl-dravite series. American Mineralogist, 84 (5) 922-928 doi:10.2138/am-1999-5-627
Bosi, Ferdinando, Lucchesi, Sergio (2004) Crystal chemistry of the schorl-dravite series. European Journal of Mineralogy, 16 (2) 335-344 doi:10.1127/0935-1221/2004/0016-0335
Marschall, Horst R., Ertl, Andreas, Hughes, John M., McCammon, Catherine (2004) Metamorphic Na- and OH-rich disordered dravite with tetrahedral boron, associated with omphacite, from Syros, Greece: chemistry and structure. European Journal of Mineralogy, 16 (5) 817-823 doi:10.1127/0935-1221/2004/0016-0817
Ertl, Andreas, Mali, Heinrich, Schuster, Ralf, Kรถrner, Wilfried, Hughes, John M., Brandstรคtter, Franz, Tillmanns, Ekkehart (2010) Li-bearing, disordered Mg-rich tourmaline from a pegmatite-marble contact in the Austroalpine basement units (Styria, Austria) Mineralogy and Petrology, 99 (1) 89-104 doi:10.1007/s00710-009-0082-1[Li-bearing dravite]
Hughes, John M., Rakovan, John, Ertl, Andreas, Rossman, George R., Baksheev, Ivan, Bernhardt, Heinz-Jรผrgen (2011) Dissymmetrization in tourmaline: the atomic arrangement of sectorally zoned triclinic Ni-bearing dravite, in Tourmaline: An ideal indicator of its host environment. The Canadian Mineralogist, 49 (1) 29-40 doi:10.3749/canmin.49.1.29
Baฤรญk, P., Uher, P., Ertl, A., Jonsson, E., Nysten, P., Kanickรฝ, V., Vaculoviฤ, T. (2012) Zoned REE-Enriched Dravite from a Granitic Pegmatite in Forshammar Bergslagen Province, Sweden an EMPA XRD and LA-ICP-MS Study. The Canadian Mineralogist, 50 (4) 825-841 doi:10.3749/canmin.50.4.825
Fantini, C., Tavares, M. C., Krambrock, K., Moreira, R. L., Righi, A. (2014) Raman and infrared study of hydroxyl sites in natural uvite, fluor-uvite, magnesio-foitite, dravite and elbaite tourmalines. Physics and Chemistry of Minerals, 41 (4) 247-254 doi:10.1007/s00269-013-0642-0
Taran, Michail N., Dyar, M. Darby, Naumenko, Ievgen V., Vyshnevsky, Olexij A. (2015) Spectroscopy of red dravite from northern Tanzania. Physics and Chemistry of Minerals, 42 (7) 559-568 doi:10.1007/s00269-015-0743-z
Bosi, Ferdinando, Skogby, Henrik, Baliฤ-ลฝuniฤ, Tonฤi (2016) Thermal stability of extended clusters in dravite: a combined EMP, SREF and FTIR study. Physics and Chemistry of Minerals, 43 (6) 395-407 doi:10.1007/s00269-016-0804-y
Berryman, E. J., Wunder, B., Ertl, A., Koch-Mรผller, M., Rhede, D., Scheidl, K., Giester, G., Heinrich, W. (2016) Influence of the X-site composition on tourmalineโs crystal structure: investigation of synthetic K-dravite, dravite, oxy-uvite, and magnesio-foitite using SREF and Raman spectroscopy. Physics and Chemistry of Minerals, 43 (2) 83-102 doi:10.1007/s00269-015-0776-3
Taran, Michail N., Naumenko, Ievgen V. (2016) Usambara effect in tourmaline: optical spectroscopy and colourimetric studies. Mineralogical Magazine, 80 (5) 705-717 doi:10.1180/minmag.2016.080.016
Rossman, G. R. (2017) Coloration of green dravite from the Commander Mine, Tanzania. The Journal of Gemmology, 35 (7) 574-575
Fuchs, Yves, Fourdrin, Chloรฉ, Balan, Etienne (2022) Theoretical OH stretching vibrations in dravite. European Journal of Mineralogy, 34 (2) 239-251 doi:10.5194/ejm-34-239-2022
Pasetti, Lorenzo, Fornasini, Laura, Mantovani, Luciana, Andรฒ, Sergio, Raneri, Simona, Palleschi, Vincenzo, Bersani, Danilo (2024) Study of MgโFe content in tourmalines from the draviteโschorl series by Raman spectroscopy. Journal of Raman Spectroscopy, 55 (2) 276-286 doi:10.1002/jrs.6645
Localities for Dravite
Showing 948 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
โ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Afghanistan | |
| Woodside et al. (2014) |
| www.gia.edu (n.d.) |
Antarctica | |
| Wadoski et al. (2011) |
| Amer.Min. (1998) | |
| Faure +1 other reference |
Argentina | |
| Colombo et al. (2012) |
| Dill et al. (2012) |
| Galliski et al. (2012) |
| Henry et al. (2009) | |
| Galliski et al. (2009) |
Australia | |
| Jones et al. (1981) |
| McKinnon et al. (2017) |
| Cruikshank et al. (1993) |
| Cruikshank et al. (1993) | |
| Mineral. Deposita 23 (1988) |
| Ahmad et al. +1 other reference |
| Carr (2008) |
| Personal collection of Keith Compton. +2 other references | |
| Carr (2008) | |
| P.A. Wulser - in the South Australian ... |
| Bottrill (2020) |
| Peter Elliott |
| Francis (2013) |
| SA Geodata Database - Mineral Deposit ... |
| HYL Brown |
| The mines & minerals of the Olary ... | |
| mentioned references in description |
| Grguric (1989) |
| Appiah et al. (2025) |
| Bottrill & Taheri |
| Bottrill +1 other reference |
| Bottrill et al. (2007) |
| Ralph Bottrill collection | |
| Kitto |
| Collected by Toby Billing out of recent ... |
| |
| Birch et al. (2007) |
| Museum Victoria collections |
| Sorrell (n.d.) |
| Jacobson et al. (2007) |
| Pavel M. Kartashov analytical data 2024 | |
| Econ Geol (1997) +1 other reference |
| Simpson (1948) |
| Simpson (1948) |
| Liontown Resoufces |
| Simpson (1948) |
| Simpson (1948) | |
| Simpson (1951) |
| Simpson (1948) |
| Pryce (1973) |
| The Simpson Mineral Collection of the ... |
| Bridge et al. (1977) | |
| Jacobson et al. (2007) +2 other references | |
| Fetherston et al. (2013) | |
| Bridge et al. (1977) | |
| Fetherston et al. (2013) | |
| Jiang et al. (2002) | |
| Yeats et al. (1998) +1 other reference |
Austria | |
| Kolitsch et al. (2019) |
| Niedermayr et al. (1995) |
| Niedermayr et al. (1994) |
| Auer et al. (2017) |
| Niedermayr et al. (1995) |
| Meixner (1960) |
| Niedermayr et al. (1995) |
| Walter et al. (2024) |
| |
| Ertl (1995) |
| Pichler (2003) |
| |
| Niedermayr et al. (1995) |
| H. Meixner: Mitteil. Naturw. Verein f. Steiermark III (1931) |
| B. Moser (2002) |
| Postl et al. (2021) |
| Niedermayr et al. (1995) +1 other reference |
| Gรถtzinger et al. (1994) +2 other references |
| Schuster R. et al. (2016) +1 other reference |
| E. Lรถffler collection |
| Kolitsch (2025) |
| Meixner (1976) +2 other references |
| Lรถffler et al. (2021) |
| Kolitsch (2014) |
| Kolitsch (2025) |
| Pristacz et al. (2009) | |
| Kolitsch (2025) +3 other references |
| Goldmann et al. (2008) | |
| Kolitsch (2021) | |
| Kolitsch et al. (2023) |
| Ertl (1995) |
| Harald Schillhammer collection |
| Kolitsch (2008) |
| Ertl (1995) |
| Ertl et al. (2002) |
| Kolitsch et al. (2012) |
| Ertl (1995) +2 other references |
| Knobloch et al. (2021) |
| Kolitsch et al. (2022) |
| Kolitsch et al. (2016) |
| Auer (2025) |
| Kolitsch et al. (2014) |
| Elmer (2020) |
| Kolitsch et al. (2015) |
| Kolitsch et al. (2023) |
| Kolitsch et al. (2023) |
| Kolitsch et al. (2016) |
| Am Min 90:2-3 pp 481-487 +1 other reference | |
| Kolitsch (2014) |
| Kolitsch (2014) |
| Kolitsch (2020) |
| Kolitsch (2025) |
| Kolitsch (2025) |
| Kolitsch et al. (2022) |
| Kolitsch et al. (2022) | |
| Andreas Ertl (pers. comm. to Uwe Kolitsch, July 2011) |
| Kolitsch et al. (2026) +1 other reference |
| Kolitsch et al. (2015) +1 other reference |
| Kolitsch et al. (2025) | |
| Kolitsch et al. (2025) | |
| Strasser (1989) |
| Kolitsch (2020) |
| Kolitsch (2016) |
| Strasser (1989) |
| Strasser (1989) | |
| Moser et al. (1991) |
| Tauscher et al. (2013) |
| Postl et al. (2021) |
| Postl (2007) |
| Taucher (1997) |
| Postl et al. (2026) |
| Postl et al. (2026) |
| Bernhard et al. (2006) |
| Postl et al. (2019) |
| Auer (2025) |
| Kolitsch et al. (2026) |
| F.Bernhard |
| www.markasit070752.ws24.cc (n.d.) |
| Neschen (n.d.) +1 other reference |
| Postl (1991) |
| C.Auer (2020) |
| Exel (1993) | |
| Postl et al. (2022) | |
| Reicht M. |
| Taucher et al. (2001) |
| Jakely (2008) |
| Meixner (1979) |
| Kolitsch et al. (2026) |
Bhutan | |
| Maciฤ g et al. (2019) |
Bolivia | |
| XRD by Jaroslav Hyrsl. Structure ... |
| ลฝรกฤek et al. (1998) +1 other reference |
| Petrov (n.d.) |
| Alfonso et al. (2025) |
| Lorin Fassbender et al. (2024) |
| Moricz et al. (2009) |
| Ahlfeld et al. (1964) |
Bosnia and Herzegovina | |
| Radosavljevic et al. (2005) |
Brazil | |
| Cassedanne et al. (1978) |
| Lavinsky (n.d.) | |
| Cassedanne et al. (1978) | |
| Barbosa et al. (2000) | |
| Kuno Stoeckli |
| Rafael Hernandes Corrรชa-Silva . |
| Queiroz (2016) |
| Sioeira et al. (1982) |
| Queiroz (2016) +1 other reference | |
| probably erroneously reported [MinRec ... |
| Russ Rizzo Collection (acquired from Luiz Menezes) | |
| Oberthรผr et al. (2008) |
| Lobato et al. (2001) |
| Cabral et al. (2002) |
| NetunoVillas et al. (2001) |
| Bull. Soc. Franรง. Minรฉralo. ... |
| Beurlen et al. (2005) +1 other reference |
| Beurlen et al. (2008) +1 other reference | |
| Beurlen +4 other references | |
| Beurlen +3 other references |
| Massuda et al. (2020) +1 other reference |
| Coelho et al. (2025) |
Bulgaria | |
| Petrusenko et al. (1996) | |
| Vasil Arnaudov et al. (2003) |
Burkina Faso | |
| Fontaine et al. (2017) |
Canada | |
| - (1998) |
| Fischer et al. (2023) |
| Breasley et al. (2024) |
| Dixon et al. (2014) +1 other reference |
| Mauthner et al. (1996) |
| Selway et al. (2000) |
| Cerny et al. 2012 +1 other reference |
| Lake et al. (2017) |
| Groat et al. (2003) | |
| Geological Association of Canada (2014) | |
| Ootes (2007) |
| Scribner et al. (2018) |
| Lynch et al. (1997) |
| Owen +3 other references | |
| Ronnie Van Dommelen collection |
| Don Doell identifications using Raman ... |
| Kontak et al. (1993) | |
| Grice (1989) |
| Kidd Operations |
| Montgomery (n.d.) |
| Montgomery (n.d.) | |
| www.geologyontario.mndm.gov.on.ca (n.d.) |
| Sorrell (n.d.) |
| Maggie Wilson photo |
| Rocks & Min. (2007) |
| Jacob Stanaszek Collection |
| Avalon Advanced Materials Inc. |
| analysis by Kerry Day (Cambridge S100 SEM, a XR-100-CR pin diode detector and DTSA software) |
| Alan Steinberg |
| Chamberlain et al. (1982) |
| Colvine (1974) |
| Kerry Day |
| MDI Number: MDI31F03NW00061 +1 other reference |
| Daver et al. (2020) |
| Donald Doell Mineral Collection |
| Horváth et al. (1990) |
| Alexandre et al. (2014) +1 other reference |
| Can. Museum of Nature specimens - WDS ... +1 other reference |
| Belley (2013) +1 other reference |
| Bruneton (1987) |
| Ruhrmann (1987) | |
| ... +1 other reference | |
| Cloutier et al. (2009) | |
| Mark Hatton (2021) |
| applications.saskatchewan.ca (n.d.) | |
| Boulanger (2012) | |
| gac.esd.mun.ca (n.d.) | |
| Boulogne et al. (2026) | |
| SRK Consulting (Canada) |
| Can Min (2002) |
Chile | |
| SEM-EDS by Joy Desor and Gerhard Mรถhn |
| samples analysed by Gerhard Mohn and ... |
| SEM-EDS by Joy Desor | |
| samples analysed by Gerhard Moehn. | |
| Miranda-Dรญaz et al. (2022) | |
| SEM-EDS by Joy Desor |
| Anglo American plc |
China | |
| Zhang et al. (2026) |
| Shen (n.d.) |
| Yueqing Yang et al. (1987) |
| Jin +2 other references |
| Su et al. (2026) | |
| Teng et al. (2025) |
| Jiang et al. (1999) |
| Luo et al. (2023) |
| Qing-chang (1981) |
| Yang et al. (2023) |
| Zhang Dequan et al. (2002) |
| Jiang et al. (1995) |
| Defeng Hui and Naiwu Zhu (2001) |
| Li et al. (2026) |
| Jiang et al. (1995) |
| Qin et al. (2023) |
| Xuemin et al. (2026) | |
| Zhu +2 other references |
| Denghong Wang et al. (2005) |
| Zhao et al. (2025) |
| Li et al. (2025) |
| Zhang et al. (2026) |
| Sun +3 other references |
| Yao et al. (2024) |
| Sun et al. (2024) |
| Xiuhua Li et al. (1996) | |
| Cunlin Liu et al. (1987) +1 other reference |
| Runxing Jia et al. (2010) |
| Xu et al. (2025) |
| Chen et al. (2025) |
Czech Republic | |
| Litochleb et al. (2000) |
| Gadas et al. (2011) |
| Povondra et al. (eds.) +1 other reference |
| Loun et al. (2011) |
| Litochleb (1995) |
| P.Pauliลก et al. (ฤ.Budฤjovice) |
| Ondruลก et al. (2003) |
| ลehoล |
| Losos et al. (1998) |
| Novรกk (2003) |
| Dolnรญฤek et al. (2019) |
| Novotnรฝ |
| Zimรกk |
| Losos et al. (1998) |
| Prachař +6 other references |
| Hofmanovi P. a R.: Pลรญspฤvek k ... |
| Welser +5 other references |
| Vรกcha et al. (2025) |
| Novรกk et al. (1999) |
| Zikeลก et al. (2011) | |
| Zikeลก |
| Novรกk |
| Historic mineral collection National ... | |
| Vrรกna |
| Houzar |
| Cempรญrek et al. (2004) |
| Nฤmec (jihozรกpadnรญ Morava) | |
| Hyrsl et al. (2009) |
| Radoล M. et al.: Doฤasnรฉ ... |
| Pauliลก P. Nejzajรญmavฤjลกรญ ... |
| Nemec (1989) |
| Cempรญrek et al. (2013) |
| Pauliลก +5 other references |
| Burianek et al. (2004) | |
| Houzar +6 other references | |
| Sekanina (1965) +1 other reference | |
| Baฤรญk et al. (2012) | |
| Flรฉgr et al. (2016) | |
| - (1993) |
| Petr Pauliลก | |
| Novรกk +3 other references | |
| P. Pauliลก (2001) | |
| P. Pauliลก (2001) | |
| ฤernรฝ P. | |
| www.cseg.ca/conferences/2000/556.PDF. +1 other reference |
DR Congo | |
| Jedwab et al. (1992) |
Eswatini | |
| Trumbull (1995) |
Ethiopia | |
| Pavel M. Kartashov (n.d.) |
Finland | |
| Grรถnholm |
| Ilkka Mikkola collection |
| Ilkka Mikkola collection | |
| Ilkka Nmikkola collection |
| Epigenetic gold occurrence in a Paleoproterozoic meta-evaporitic sequence in the Rompas-Rajapalot Au system et al. (1) |
| [var: Chromium-bearing Dravite] Peltola et al. (1968) |
| Vasilopoulos et al. (2021) |
| [var: Chromium-bearing Dravite] Dunn (1977) |
| [var: Chromium-bearing Dravite] Huhma & Aarto (1964) | |
| Sandstrรถm et al. (2009) |
| Lahti +1 other reference |
France | |
| Blondieau et al. (2024) |
| Blondieau et al. (2024) | |
| Bรฉreyziat et al. (2025) +1 other reference |
| De Ascenรงรฃo Guedes et al. (2015) |
| Chopin (1978) |
| Chopin (1978) |
| De Ascenรงao Guedes et al. (2011) | |
| |
| Wittern et al. (1997) |
| Descouens (1984) +2 other references |
| Inventaire mineralogique de l'Ariege (Ed. BRGM) |
| Queneau (n.d.) |
| www.geologie-tournefeuille.com (2004) |
| C. Derrรฉ |
| Pรฉrinet (n.d.) |
| Heavy sands collected by Christian ... |
| Laurent J-M. (2002) |
| Pierrot et al. (1978) | |
| Patrice Queneau Collection First ... |
| J.P. Couturiรฉ : "Le Massif Granitique de La Margeride (Massif Central Franรงais) |
| Berbain et al. (2005) |
| Guitard (2010) |
| Guitard (2010) | |
| Heavy sands collected by Christian ... |
| Guitard (2010) |
| Guitard (2010) | |
| Benjamin Dupont Collection |
| Carballo (2013) | |
| Queneau (n.d.) |
| Georges FAVREAU collection and EDX ... |
| Georges FAVREAU collection & EDX ... +2 other references |
| Favreau et al. (2024) | |
| Favreau et al. (2024) | |
Germany | |
| 70. +1 other reference |
| Habel (2009) |
| Habel (2011) |
| Habel (2007) |
| Weiร (1990) |
| Grimm (1991) |
| Erik Hock |
| Dill et al. (2012) |
| Dill et al. (2008) | |
| Dill et al. (2008) |
| Schwarzmeier et al. (2015) +2 other references |
| Giesler et al. (2020) |
| Lapis 34 (7-8) |
| |
| Gerhard Mรถhn Collection Analyzed by ... |
| Lapis 38 (5) +1 other reference |
| Joy DESOR EDX analysis |
| Witzke et al. (2008) |
| Wittern (2001) |
| Hajek (2010) |
| Lapis 30 (7/8) | |
| Witzke et al. (2008) |
| Witzke et al. (2006) |
| Bartnik (1992) |
| Thomas et al. (2022) |
| HAAKE et al. (1994) |
| Wittern (2001) |
Ghana | |
| Goodenough et al. (2025) |
Greece | |
| SEM-EDS by Joy Desor and Gerhard Mรถhn |
| Uwe Kolitsch (SEM-EDS analyses, to be published) |
| Marschall et al. (2004) |
| Fรคrber (n.d.) |
Greenland | |
| Geology and Ore no. 10 |
| Petersen |
Guyana | |
| Mahdia Gold Corporation |
Honduras | |
| Alunno S et al. (2014) |
Hungary | |
| ... |
| Sรกndor et al. (2005) |
| Koch (1985) |
| Szakรกll et al. (1996) | |
| Geoda | |
India | |
| Sarma et al. (2004) |
| Pal et al. (2025) | |
| Devaraju et al. (1999) | |
| Meshram et al. (2012) +1 other reference |
| Sharon Cisneros and Brian Kosnar ... |
| Deb et al. (1997) +2 other references |
| Rout et al. (2022) |
| Anand et al. (2022) |
Indonesia | |
| Etzel et al. (2015) |
Iran | |
| Nezafatis (2006) |
Ireland | |
| Barros et al. (2022) |
| Barros et al. (2022) | |
Italy | |
| AMI UK Service |
| Piccoli et al. (2007) |
| Piccoli et al. (2007) | |
| analyzed in Messina University |
| Lapis 28 (12) |
| Analyses of Anthony Kampf of Natural ... +1 other reference |
| First identified by Matteo Azili and ... |
| Castellaro-Kampf |
| Maida (2002) |
| Maida (2002) | |
| Natale Calanchi (1980) | |
| Magistretti L. (1946) +3 other references |
| Bedognรจ et al. (2006) |
| Bedognรจ et al. (1993) |
| Bedognรจ et al. (1993) |
| Bedognรฉ et al. (1995) |
| Bedognรจ et al. (2006) | |
| - (n.d.) |
| Ghizzoni et al. (2005) | |
| Zanchetta et al. (2022) |
| Bedognรจ et al. (2006) |
| Bedognรจ et al. (1993) | |
| Bedognรฉ et al. (1995) |
| F. Brignoli collection 2010 +1 other reference |
| Martini et al. (2012) |
| Martini et al. (2012) | |
| Franco Luca Bonino's collection |
| Marello et al. (2020) |
| Marello et al. (2020) | |
| Piccoli et al. (2007) |
| Mandarino (1996) | |
| Simone Ferrero collection. | |
| Giuseppe Finello collection | |
| Franco Luca Bonino's collection |
| Piccoli et al. (2007) |
| Deidda et al. (2022) |
| SEM-EDS + Gandolfi XRD: SIUK AMI โ ... |
| Chrysovalantis Efstathiou | |
| ALBERTINI C. (2014) |
| Piccoli et al. (2007) |
| Spezia (1881-1882) +1 other reference |
| Bonino Franco Luca's Collection +2 other references | |
| Cuchet et al. (2022) |
| Preite et al. (1995) |
| Roggiani (1975) +1 other reference |
| Piccoli et al. (2007) |
| Mattioli (1979) |
| Mattioli V. (1976) +2 other references | |
| Angelo Brambilla Collection | |
| Mattioli (1979) | |
| Mattioli (1979) | |
| Mattioli (1979) +1 other reference | |
| Alberto Vaghi specimen |
| Piccoli et al. (2007) |
| V. Mattioli (1978) |
| Boscardin et al. (2013) |
| Mattioli (1979 b) +3 other references |
| Rivista Mineralogica Italiana |
| Billows (1941) |
| Gamboni et al. (2021) |
| Vecchi et al. (2013) |
| Vignola et al. (2018) |
| Gasparetto et al. (2014) |
| Fei (2010) |
| Marinai | |
| Nannoni et al. (2008) |
| Orlandi et al. (2004) |
| Orlandi et al. (2009) |
| Orlandi et al. (1976) +1 other reference |
| Bersani et al. (2006) |
| Orlandi et al. (2009) | |
| Orlandi et al. (2009) | |
Japan | |
| Introduction to Japanese Minerals (Geological Survey of Japan, 1970) |
| - (n.d.) |
| Nakajima et al. (2006) |
| Yamada (2004) |
| Kitahara (1966) |
| Watanabe J and Hasegawa K (1986) |
| - (n.d.) |
| [var: Chromium-bearing Dravite] Akira Harada et al. (2010) |
| R. Tanaka |
| Uehara et al. (2014) | |
| Uehara et al. (2014) |
| - (n.d.) |
| Akira Kato (undated manuscript) |
| Bamba (1978) |
| Petrov (n.d.) |
Kenya | |
| Taran et al. (2015) |
| Mattson et al. (1984) |
| [var: Chromium-bearing Dravite] Betts (n.d.) |
| Simonet (2000) |
| Simonet (2000) | |
Madagascar | |
| Yang et al. (2024) |
| Bruyรจre et al. (2016) |
| Marko Burkhardt Collection |
| Andrianjakavah et al. +2 other references |
| Di Cecco (2013) +1 other reference | |
| Behier (1963) |
| Behier (1963) |
| Ranorosoa (1986) | |
| Ranorosoa (1986) |
| Ranorosoa (1986) | |
| Ranorosoa (1986) |
| Ranorosoa (1986) | |
| Knut Edvard Larsen collection # MM-1485 (not analyzed) |
| Ranorosoa (1986) |
| Ranorosoa (1986) | |
| Ranorosoa (1986) |
| Pezzotta et al. (2005) +1 other reference |
| Ranorosoa (1986) |
Mali | |
| Masurel et al. (2017) |
| Randgold Resources |
Mexico | |
| Betts (n.d.) | |
| Panczner (1987) |
| Jones et al. (2021) +1 other reference |
| Peter Megaw (pers. comm. to Rolf Luetcke, 2019) |
| Van Nostrand Rdinhold Co. +2 other references | |
| Panczner (1987) | |
Morocco | |
| Mahjoubi et al. (2016) |
Mozambique | |
| Bosi et al. (2025) |
| |
Myanmar | |
| Themelis (2008) |
| Themelis (2008) |
| Mountain Minerals International specimen | |
| Pavel M. Kartashov analytical data |
| Garnier et al. (2002) |
Namibia | |
| Bezing et al. (2007) |
| Bezing et al. (2007) | |
| von Bezing (2007) |
| Sun (2006) |
| Niedermayr (2001) |
Nepal | |
| Bhandari et al. (2022) |
| Cooper (1997) |
| - (n.d.) |
| - (n.d.) |
| Richard Dale Collection |
New Zealand | |
| Grice et al. (1989) |
| GRAPES et al. (1996) |
Nigeria | |
| Jimoh (2016) |
North Korea | |
| Ogura (1969) |
| Ogura (1969) |
North Macedonia | |
| ฤobiฤ et al. (2025) |
Norway | |
| Kolitsch et al. (2011) |
| Garmo (2003) +1 other reference |
| Breivik (2001) |
| Eldjarn (2008) |
| Rosenquist (1949) |
| Nelen et al. (1977) +1 other reference | |
| Larsen et al. (1999) |
| Larsen et al. (1999) |
| Jahren et al. (1998) |
| Wilke (1976) |
| Garmo (2007) |
| Larsen et al. (1999) |
| Larsen et al. (1999) | |
| Kolitsch et al. (2013) |
| Larsen et al. (1999) |
| Larsen et al. (1999) | |
| Larsen et al. (1999) |
| Larsen et al. (1999) |
| Tomas Husdal - collection |
| Stuart Mills 17.11.2002 |
| Stuart Mills 17.11.2002 | |
| Larsen et al. (2013) | |
| Nelen et al. (1977) +1 other reference |
| Neumann et al. (1960) +1 other reference | |
| Wel (1973) | |
| de La Cruz Rodrigues (2021) +1 other reference |
| Larsen et al. (1999) +1 other reference | |
| Larsen et al. (1999) |
| Larsen et al. (2009) |
| Nordrum (2000) |
| Larsen et al. (2020) |
| Larsen et al. (2021) |
| Larsen et al. (2020) |
| Larsen et al. (2020) |
| Larsen et al. (2020) | |
| Larsen et al. (1999) +1 other reference |
| Larsen et al. (2020) |
| Bรธe (2001) |
| |
| Bรธe (2000) +2 other references | |
| Nordrum (1999) | |
| Nordrum (2012) |
| Witsรธ (1995) |
| Nordrum (2009) | |
| Witsรธ (1994) | |
| Witsรธ (2005) |
Pakistan | |
| - (2004) |
| Jan et al. (1995) |
| Arif et al. (1996) +2 other references |
Peru | |
| Karel Bal Collection |
| Roth et al. (2012) |
| Corthay et al. (2014) |
| Mlynarczyk (2005) +1 other reference | |
Poland | |
| SZUSZKIEWICZ et al. (2013) |
| Majka J. et al. (2008) |
| Sฤk et al. (2023) |
| Sฤk | |
| Domaลska-Siuda J. 2010: New data on secondary uranium minerals from the Western Sudetes (Poland) | |
| Lis et al. (1986) |
| Pieczka A. et al. (1996) +1 other reference |
| Lis et al. (1986) |
| Pieczka (2007) +3 other references |
| Szopa +4 other references |
| Szopa +4 other references | |
Portugal | |
| Marques de Sรก et al. (2010) |
| Figueiras +4 other references | |
| Self-find by Nuno Afonso +1 other reference |
| Alves (n.d.) |
| Dias et al. (2009) |
Romania | |
| Varga et al. (2023) |
| Hรขrtopanu et al. (1996) |
| Szakรกll (2002) | |
| Pintea et al. (2005) |
| Paulina HIRTOPANU & Gheorghe UDUBASA (2015) +2 other references |
| Androne D.A.M. et al. (2004) |
Russia | |
| Scott (2012) |
| Plotinskaya et al. (2020) |
| Sorokina et al. (2019) |
| Korinevsky et al. (2022) |
| Plotinskaya et al. (2014) |
| Nagornaya et al. (2021) |
| Chitalin et al. (2023) |
| Mineralogy of the Peschanka porphyry copper deposit et al. (Trans. Inst. Min. Metall. B) | |
| Baksheev et al. (2025) |
| Reznitsky et al. (2013) +2 other references |
| Lennikov et al. (2004) |
| ะะตะบะธะฝ (2010) +1 other reference | |
| Ivanyuk et al. (2008) |
| [World of Stones 12:49] | |
| Erokhin et al. (2014) |
| I.A. Baksheev and O.E. Kudryavtseva (2004) +2 other references |
| Baksheev et al. (2004) | |
| Pavel M. Kartashov (n.d.) |
| Pavel M. Kartashov (n.d.) | |
| ะะพะฟะพะฒ et al. (2018) | |
| I.A. Baksheev and O.E. Kudryavtseva (2004) +1 other reference |
| Zakharov et al. (2022) | |
| S.Kolesnichenko |
| according last founds on this point |
| Mishainik |
| Baksheev et al. (2025) |
| Kuzhuget et al. (2015) |
| Kuzhuget et al. (2022) | |
| Lees et al. (2019) |
| Grant (2001) |
| Kasatkin et al. (2014) |
| Spiridonov et al. (2010) +1 other reference |
| Baksheev et al. (2015) | |
| Baksheev et al. (2015) | |
Slovakia | |
| Ozdรญn D. +1 other reference |
| Michลovรก J. et al. (Praha) | |
| ฤuฤa R. et al. (1993) | |
| Kodฤra et al. (1986) |
| Prลกek et al. (2010) | |
| Kodฤra et al. (1986) |
| Ferenc ล . et al. (2014) |
| Ferenc ล et al. (Kokava nad Rimavicou) |
| Uher P. & Ozdรญn D. |
| Baฤรญk et al. (2015) |
| ฤuฤa (1993) |
| Baฤรญk et al. (2008) |
| Baฤรญk et al. (2008) |
| Uher et al. (2026) | |
| Uher et al. (2009) |
| Baฤรญk et al. (2022) |
| Prลกek J. & Lauko ฤฝ. (Spiลกsko-gemerskรฉ rudohorie) | |
| Baฤรญk et al. (2022) | |
| Kubiลก M. (2006) |
| Ferenc ล . et al. (2019) |
| Ozdรญn D. | |
| Kodฤra et al. (1986) | |
| Uher P. et al. (2018) |
| Kodฤra et al. (1986) |
| Baฤรญk P. et al. (gemerikum, Slovensko) | |
| Kodฤra et al. (2025) |
| Ozdรญn D. et al. (in Slovak) +1 other reference |
| Ozdรญn D. +1 other reference |
| Baฤรญk et al. (2018) |
| Kodฤra et al. (1986) |
| ฤuda et al. (1996) | |
| Uher P. & Ozdรญn D. (Tribeฤ, Slovensko) |
| Baฤรญk P. et al. (2006) +1 other reference |
| Bacik et al. (2011) |
Slovenia (TL) | |
| G. Tschermak (1883) +1 other reference |
| - (n.d.) | |
South Africa | |
| Cairncross et al. (1995) |
| Cairncross et al. (1995) |
| www.mindat.org (n.d.) |
| Cairncross et al. (1995) |
| Cairncross et al. (1995) |
Spain | |
| Georges FAVREAU collection + EDS |
| Colecciรณn Juan A.M. Barnestein |
| Colecciรณn Juan A.M. Barnestein |
| Alfonso et al. (2000) +1 other reference |
| & locality references +1 other reference | |
| Joan Rosell - Soledad รlvarez - Jordi Ibรกรฑez (2021) |
| Angel Ortiz Maellas specimen |
| Jimรฉnez Martรญnez | |
| www.foro-minerales.com (n.d.) | |
| Angel Ortiz Maellas specimen | |
| J.I. Gil Ibarguchi |
| Martin-Izard et al. (1995) |
Sri Lanka | |
| Nasdala et al. (2021) |
| Ceylon Aluvial Mine (Book, Co. 2002) |
Sweden | |
| Jonsson (1996) +2 other references |
| Gatedal (n.d.) |
| Gatedal (n.d.) |
| Baฤรญk et al. (2012) +1 other reference |
| Gatedal (n.d.) |
| Gatedal (n.d.) |
| Gatedal (n.d.) |
| Gatedal (n.d.) |
| Gatedal (n.d.) | |
| Gatedal (n.d.) |
| |
| The Swedish Museum of Natural History ... +1 other reference |
| |
| Selway et al. (2002) |
| Selway et al. (2002) | |
| Gustafsson et al. (1991) +1 other reference |
| Holtstam et al. (1999) |
| Sandstrรถm (2002) |
| Econ Geol (1996) +1 other reference |
| Vincent Bourgoin specimen |
| Gatedal (n.d.) |
Switzerland | |
| Romani (2000) |
| Romani (2000) | |
| Romani (2000) |
| Stalder et al. (1998) |
| Stalder et al. (1998) | |
| Stalder et al. (1998) | |
| Dill (2008) |
| Redler et al. (2016) |
| Stalder et al. (1998) |
| Weiร et al. (2015) +1 other reference |
| Weiร et al. (2015) +1 other reference | |
| Wilson (2023) |
| |
| |
| |
| Stalder et al. (1998) +1 other reference |
| Kolitsch et al. (1996) | |
| |
| |
| |
| |
| Most recent: Gea 1993/04 p.137 with ... | |
| 50. (in German) +1 other reference | |
| Ansermet (2012) |
| Ansermet et al. (2021) |
| Ansermet et al. (2011) |
Taiwan | |
| Juang (1984) |
Tajikistan | |
| I. Pekov data pers. comm L. Horvath 2008 |
| Levitskii V.I. (1990) +1 other reference |
| Labuntsov et al. (1930) +3 other references |
| Grew et al. (1998) | |
| Grew et al. (1998) | |
| Sorokina et al. (2015) |
Tanzania | |
| s3.amazonaws.com (2022) | |
| Werner Radl collection +1 other reference |
| Rossman et al. (2016) |
| Wilson et al. (2009) |
| Excalibur Mineral Corp. - Mineral News +1 other reference | |
| Lopatkin Oleg Collection +1 other reference |
| Hintze (2010) |
Thailand | |
| Patrice Queneau Collection. Visual ... |
| Manning (1982) |
| Manning (1982) | |
Turkey | |
| Yavuz et al. (2008) |
| BOZKAYA et al. (2014) |
UK | |
| Duchoslav et al. (2017) |
| Fitch et al. (2022) |
| Drivenes (2022) |
| LeBoutillier et al. (2003) |
| Mรผller et al. (2005) |
| Tindle (2008) |
| Ko Jansen | |
| Golley et al. (1995) |
| Golley et al. (1995) |
USA | |
| Cook et al. (1982) |
| - (2008) |
| Anthony et al. (1995) |
| Anthony et al. (1995) |
| Robert Housley Mindat Article "Gem ... |
| Dunning et al. (2005) |
| Dunning et al. (2005) | |
| Dunning et al. (2005) | |
| Dunning et al. (2005) | |
| Osborn et al. (discoverer/owner) +1 other reference |
| [micromounts@yahoogroups.com] |
| Cooney (1956) +3 other references |
| Foord (1977) |
| Cooper et al. (1986) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Eckel et al. (1997) |
| Labels from Earl Sullivan collection +1 other reference |
| David Busha collection |
| John Burnham collection |
| Rocks & Min.: 70:398 |
| Rocks & Min.: 70:403 |
| Rocks & Min.: 70:403 +1 other reference |
| Bill Barrett Coll. |
| former Ronald Januzzi collection. |
| Cook (1978) |
| Rocks & Min.: 64:194. |
| Cook (1978) |
| Rocks & Min. 70:246 +3 other references |
| Ream (2004) |
| King et al. (1994) |
| Ayuso et al. (1984) +1 other reference |
| King (2000) |
| King et al. (1994) +1 other reference |
| King et al. (1994) +1 other reference | |
| Dyar et al. (1998) | |
| King et al. (1994) +1 other reference | |
| King et al. (6) +1 other reference | |
| chemical analysis and microscopically ... +2 other references |
| Thompson et al. (1998) |
| Vandall King |
| Rocks & Min.: 21:274-275. |
| Bernstein (1980) |
| Bernstein (1976) |
| [var: Chromium-bearing Dravite] Foord et al. (1981) |
| Bernstein (1980) |
| Parker (2005) |
| Wilson (2014) |
| Harvard Museum of Natural History | |
| Francis (1988) | |
| Francis (1988) |
| King (n.d.) |
| Paul Senn Field Work/Research |
| Quillen (2017) |
| Castor et al. (2004) |
| |
| Francis (1988) +1 other reference |
| Meyers et al. (1956) |
| Peter Cristofono collection |
| Nelen et al. (1977) +1 other reference |
| PJD (1995, 2004) |
| Moritz (n.d.) |
| van Rossen (2026) |
| Patrick Haynes. PXRD and EDS by Inna ... |
| Northrop et al. (1996) |
| 2009 New Mexico Mineral Symposium ... +1 other reference |
| Northrop et al. (1996) |
| Northrop et al. (1996) | |
| Northrop et al. (1996) |
| Robinson et al. (2007) |
| Manchester (1931) |
| Manchester (1931) |
| Chamberlain et al. (2013) |
| Rocks & Minerals 85:250-259 |
| Lupulescu et al. (2014) |
| The New York State Museum Catalog No. ... |
| Peterson et al. (1984) | |
| TSCHERMAK (1884b) | |
| Robinson et al. (2007) +1 other reference | |
| Chiarenzelli et al. (2019) |
| - (eski / Noah) +1 other reference | |
| Chamberlain et al. (2013) | |
| Walter et al. (2022) | |
| www.mindat.org (n.d.) +2 other references | |
| Chamberlain et al. (2013) | |
| Chamberlain et al. (2013) | |
| Walter (2022) |
| Chamberlain et al. (2010) +1 other reference | |
| Petrov (n.d.) |
| Robinson et al. (2007) +1 other reference |
| Rocks & Minerals (1955) |
| Larsen et al. (1932) |
| Taylor et al. (1984) +1 other reference |
| Wood (1996) |
| Wood (1996) | |
| Rocks & Min.:60:88. |
| Streeter (2003) | |
| |
| jbs collection Smithsonian Institution ... |
| Magma Field Trip Reports |
| Smithsonian Institution Mineral ... | |
| Dyar et al. (1998) +1 other reference | |
| Geological Society of America Vol.44 +1 other reference | |
| Carnegie Museum of Natural History ... |
| Lapham et al. (1965) |
| [var: Chromium-bearing Dravite] Foord et al. (1981) |
| Montgomery (1955) +1 other reference |
| M. W. Kieron collection |
| - (1984) +1 other reference |
| Petrov (n.d.) |
| Personal Collection +1 other reference |
| Rocks & Min. Vol. 71 (1996) |
| Rocks & Min 71:330 |
| Francis (1988) |
| Dietrich (1990) |
| Dietrich (1990) |
| Dietrich (1990) |
| Dietrich (1990) |
| Dietrich (1990) |
| Loud et al. (2023) |
| Dietrich (1990) |
| ID'd by Tony Kampf. I had listed them ... |
| Rocks & Min.:60:170. |
| Rocks and Minerals 66:6 |
| Aidan Cerenzie Collection |
| Rocks and Minerals 66:6 | |
Vietnam | |
| Pham Van Long et al. (2004) |
| Blauwet (2006) | |
| Pham Van Long et al. (2004) | |
| Pham Van Long et al. (2004) | |
| Pham Van Long et al. (2004) +1 other reference | |
| Pham Van Long et al. (2004) | |
| Pham Van Long et al. (2004) | |
Zambia | |
| - (Hanco) |
| Schmetzer et al. (2011) |
| Stanislav Vrรกna photo and specimen |
| MacIntyre (2019) |
Zimbabwe | |
| Asa Resource Group plc |
| Frei et al. (1998) | |
| Frei et al. (1998) | |
| Johnson et al. (1998) +1 other reference |
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Brumado, Bahia, Brazil