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Tremolite
A valid IMA mineral species - grandfathered
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About TremoliteHide
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Formula:
โปCa2Mg5(Si8O22)(OH)2
The tremolite-actinolite series are defined as calcium amphiboles with A(Na+K+ 2Ca)<0.5 apfu and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH), F or Cl.
Tremolite is defined with
C2+ position: Mg>4.5 apfu
W position: (OH) dominant.
Tremolite is one of the few amphiboles that has not been redefined or renamed in any of the amphibole nomenclature reports.
Tremolite is defined with
C2+ position: Mg>4.5 apfu
W position: (OH) dominant.
Tremolite is one of the few amphiboles that has not been redefined or renamed in any of the amphibole nomenclature reports.
Colour:
White, brown, colourless, grey, light green, green, light yellow, pink-violet
Lustre:
Vitreous, Silky
Hardness:
5 - 6
Specific Gravity:
2.99 - 3.03
Crystal System:
Monoclinic
Member of:
Name:
Named in 1789 by Johann Georg Albrecht Hรถpfner for the Tremola Valley (Val Tremola), Central St Gotthard Massif, Tessin, Switzerland, where the type material supposedly came from, according to the dealer from whom he had acquired the specimens. However, modern investigations of what is considered the type material, conserved in Geneva, revealed that the true type locality is Campolungo, 14 km further south. (Unlike Campolungo, Val Tremola lies north of the isograd delineating the first appearance of tremolite). This mineral was earlier (1782) called Sรคulenspath and Sternspath by Johann Ehrenreich von Fichtel for material from Sebeลu de Jos, Transylvania, Romania (for a full account of the early history of tremolite, see Roth, 2006, https://mineralogicalrecord.com/wp-content/uploads/2020/10/pdfs/TREMOLITE-Edited.pdf.
Tremolite forms a continuous series with the other minerals in the actinolite-tremolite series. It also forms a continuous series with edeniteNaCa2Mg5(Si7Al)O22(OH)2, richteriteNa(CaNa)Mg5(Si8O22)(OH)2 and fluoro-tremoliteโปCa2Mg5(Si8O22)F2. At elevated PT conditions (upper amphibolite - granulite facies), the actinolite-tremolite series minerals also form a continuous series with the hornblende root name groupโปCa2(C2+4C3+)(AlSi7O22)W2 minerals. Intermediate compositions between cummingtoniteโปMg2Mg5(Si8O22)(OH)2 and tremolite are also known. Tremolite is one of the few amphiboles that can be identified by EDS with reasonable certainty.
Tremolite is an important rock-forming mineral and occurs most commonly as a white to light green, granular to fibrous component of metamorphosed carbonate rocks, especially skarns and dolomite marbles, where the crystals and aggregates can become quite large. Any light colored amphibole in a marble will normally be tremolite. Large isolated and well-terminated crystals are rare. In this environment, it commonly forms as pseudomorphs of tremolite after diopside, but can also be primary. Tremolite is also common in many metamorphosed mafic and ultramafic rocks such as amphibolites and metabasalts although actinolite and other iron-rich amphiboles usually dominate there. Fibrous (asbestiform) tremolite veins are common in many metamorphic rock types, especially where they are carbonate-bearing. In meta-igneous rocks, cummingtonite and anthophyllite can be difficult to distinguish from tremolite, but these are more restricted to metamorphosed Ca-poor ultramafic rocks like serpentinites.
Although the most common color of tremolite is white or other pale colors, it may also be brown, greenish (coloured by Fe), grass-green (colored by Cr and/or V) or purple (coloured by Mn).
Tremolite coloured green by chrome (Cr3+) is often called chrome-tremoliteโป{Ca2}{Mg5}(Si8O22)(OH)2, whereas the purple variety, coloured by manganese, is called hexagoniteโป{Ca2}{(Mg,Mn)5}(Si8O22)(OH)2.
The amphibole varieties byssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 (hair-like fibres), and nephrite can consist, fully or partly, of tremolite.
Tremolite may be highly fibrous to asbestiform, and can then be included in the group of materials called asbestos, though it was rarely used commercially. As with all asbestiform minerals, this fibrous variety is considered carcinogenic if ground into fine dust and inhaled in large amounts, so people should use care in its handling.
White fibrous tremolite may be confused with wollastoniteCa3(Si3O9) or anthophylliteโปMg2Mg5(Si8O22)(OH)2.
For further information, see the tremolite best minerals article, see link: http://www.mindat.org/mesg-86-198178.html
Visit gemdat.org for gemological information about Tremolite.
Fibrous habit.
Byssolite habit
Star and fan formed aggregates
single crystal
Pseudomorph after diopside
Fibrous habit.
Byssolite habit
Star and fan formed aggregates
single crystal
Pseudomorph after diopside
Fibrous habit.
Byssolite habit
Star and fan formed aggregates
single crystal
Pseudomorph after diopside
Tremolite is an important rock-forming mineral and occurs most commonly as a white to light green, granular to fibrous component of metamorphosed carbonate rocks, especially skarns and dolomite marbles, where the crystals and aggregates can become quite large. Any light colored amphibole in a marble will normally be tremolite. Large isolated and well-terminated crystals are rare. In this environment, it commonly forms as pseudomorphs of tremolite after diopside, but can also be primary. Tremolite is also common in many metamorphosed mafic and ultramafic rocks such as amphibolites and metabasalts although actinolite and other iron-rich amphiboles usually dominate there. Fibrous (asbestiform) tremolite veins are common in many metamorphic rock types, especially where they are carbonate-bearing. In meta-igneous rocks, cummingtonite and anthophyllite can be difficult to distinguish from tremolite, but these are more restricted to metamorphosed Ca-poor ultramafic rocks like serpentinites.
dark brown tremolite
green tremolite, colored by Fe
var. hexagonite, colored by Mn
var chrome-tremolite colored by Cr and/or V
dark brown tremolite
green tremolite, colored by Fe
var. hexagonite, colored by Mn
var chrome-tremolite colored by Cr and/or V
dark brown tremolite
green tremolite, colored by Fe
var. hexagonite, colored by Mn
var chrome-tremolite colored by Cr and/or V
Although the most common color of tremolite is white or other pale colors, it may also be brown, greenish (coloured by Fe), grass-green (colored by Cr and/or V) or purple (coloured by Mn).
Tremolite coloured green by chrome (Cr3+) is often called chrome-tremoliteโป{Ca2}{Mg5}(Si8O22)(OH)2, whereas the purple variety, coloured by manganese, is called hexagoniteโป{Ca2}{(Mg,Mn)5}(Si8O22)(OH)2.
The amphibole varieties byssoliteAX2Z5((Si,Al,Ti)8O22)(OH,F,Cl,O)2 (hair-like fibres), and nephrite can consist, fully or partly, of tremolite.
Tremolite may be highly fibrous to asbestiform, and can then be included in the group of materials called asbestos, though it was rarely used commercially. As with all asbestiform minerals, this fibrous variety is considered carcinogenic if ground into fine dust and inhaled in large amounts, so people should use care in its handling.
White fibrous tremolite may be confused with wollastoniteCa3(Si3O9) or anthophylliteโปMg2Mg5(Si8O22)(OH)2.
For further information, see the tremolite best minerals article, see link: http://www.mindat.org/mesg-86-198178.html
Visit gemdat.org for gemological information about Tremolite.Unique IdentifiersHide
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Mindat ID:
4011
Long-form identifier:
mindat:1:1:4011:8
IMA Classification of TremoliteHide
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Approved, 'Grandfathered' (first described prior to 1959)
IMA Formula:
โปCa2(Mg5.0-4.5Fe2+0.0-0.5)Si8O22(OH)2
Classification of TremoliteHide
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9.DE.10
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
9 : SILICATES (Germanates)
D : Inosilicates
E : Inosilicates with 2-periodic double chains, Si4O11; Clinoamphiboles
66.1.3a.1
66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
1 : Amphiboles - Mg-Fe-Mn-Li subgroup
66 : INOSILICATES Double-Width,Unbranched Chains,(W=2)
1 : Amphiboles - Mg-Fe-Mn-Li subgroup
14.6.13
14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both
14 : Silicates not Containing Aluminum
6 : Silicates of Ca with alkali or Mg or both
Mineral SymbolsHide
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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 |
|---|---|---|
| Tr | IMAโCNMNC | Warr, L.N. (2021). IMAโCNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Tr | Kretz (1983) | Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277โ279. |
| Tr | 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 |
| Tr | 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 |
| Tr | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
| Tr | Warr (2020) | Warr, L.N. (2020) Recommended abbreviations for the names of clay minerals and associated phases. Clay Minerals, 55, 261โ264 doi:10.1180/clm.2020.30 |
Pronunciation of TremoliteHide
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Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Jolyon Ralph | United Kingdom |
Physical Properties of TremoliteHide
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Vitreous, Silky
Transparency:
Transparent, Translucent
Colour:
White, brown, colourless, grey, light green, green, light yellow, pink-violet
Streak:
White
Hardness:
5 - 6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {110}
on {110}
Parting:
on {010} {100}
Fracture:
Splintery
Density:
2.99 - 3.03 g/cm3 (Measured) 2.964 g/cm3 (Calculated)
Optical Data of TremoliteHide
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Type:
Biaxial (-)
RI values:
nα = 1.599 - 1.612 nβ = 1.613 - 1.626 nγ = 1.625 - 1.637
2V:
Measured: 88° to 80°, Calculated: 82° to 84°
Max. Birefringence:
δ = 0.025 - 0.026
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.
The central grain is always Tremolite.
Background grains can be mixed with reference minerals below
(80% max total). Total: 0%
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 biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
r < v weak
Chemistry of TremoliteHide
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Mindat Formula:
โปCa2Mg5(Si8O22)(OH)2
The tremolite-actinolite series are defined as calcium amphiboles with A(Na+K+ 2Ca)<0.5 apfu and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH), F or Cl.
Tremolite is defined with
C2+ position: Mg>4.5 apfu
W position: (OH) dominant.
Tremolite is one of the few amphiboles that has not been redefined or renamed in any of the amphibole nomenclature reports.
The tremolite-actinolite series are defined as calcium amphiboles with A(Na+K+ 2Ca)<0.5 apfu and with C(Al+Fe3++2Ti)<0.5 apfu. The W position may contain (OH), F or Cl.
Tremolite is defined with
C2+ position: Mg>4.5 apfu
W position: (OH) dominant.
Tremolite is one of the few amphiboles that has not been redefined or renamed in any of the amphibole nomenclature reports.
Element Weights:
Common Impurities:
Ti,Mn,Al,Cr,Na,K,F,Cl,H2O
Chemical AnalysisHide
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Oxide wt%:
| 1 | |
|---|---|
| SiO2 | 56.75 % |
| TiO2 | 0.09 % |
| Al2O3 | 2.15 % |
| Fe2O3 | |
| FeO | 4.19 % |
| MnO | 0.16 % |
| MgO | 21.3 % |
| CaO | 10.36 % |
| Na2O | 2.62 % |
| K2O | 0.16 % |
| Total: | 97.78 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Sierra de las Minas, Motagua Valley, Guatemala | Sample from late forming veins in jadeitite |
Crystallography of TremoliteHide
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Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 9.84 Å, b = 18.02 Å, c = 5.27 Å
β = 104.95°
β = 104.95°
Ratio:
a:b:c = 0.546 : 1 : 0.292
Unit Cell V:
902.83 ร
ยณ (Calculated from Unit Cell)
Z:
2
Morphology:
Elongated, stout prismatic, bladed, fibrous, granular, columnar crystals and aggregates.
Twinning:
Simple or multiple: common parallel to {100}, rarely parallel to {001}
Crystal StructureHide
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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) |
|---|---|---|---|---|---|---|---|
| 0006210 | Tremolite | Antao S M, Hassan I, Wang J, Lee P L, Toby B H (2008) State-of-the-art high-resolution powder X-ray diffraction (HRPXRD) illustrated with Rietveld structure refinement of quartz, sodalite, tremolite, and meionite The Canadian Mineralogist 46 1501-1509 |  | 2008 | Gouverneur district, New York | 0 | 293 |
| 0004630 | Tremolite | Ballirano P, Andreozzi G B, Belardi G (2008) Crystal chemical and structural characterization of fibrous tremolite from Susa Valley, Italy, with comments on potential harmful effects on human health American Mineralogist 93 1349-1355 | | 2008 | Condove, Susa Valley, Italy | 0 | 293 |
| 0006113 | Tremolite | Hawthorne F C, Oberti R, Martin R F (2006) Short-range order in amphiboles from the Bear Lake diggings, Ontario The Canadian Mineralogist 44 1171-1179 | | 2006 | Bear Lake diggings, Bancroft area of Ontario, Canada | 0 | 293 |
| 0005419 | Tremolite | Jenkins D M, Hawthorne F C (1995) Synthesis and rietveld refinement of amphibole along the join Ca2Mg5Si8O22F2 - NaCa2Mg4Ga3Si6O22F2 The Canadian Mineralogist 33 13-24 | | 1995 | Synthetic | 0 | 293 |
| 0001836 | Tremolite | Yang H, Evans B W (1996) X-ray structure refinements of tremolite at 140 and 295 K: Crystal chemistry and petrologic implications American Mineralogist 81 1117-1125 | | 1996 | 0 | 295 | |
| 0003771 | Tremolite | Oberti R, Camara F, Ottolini L (2005) Clinoholmquistite discredited: The new amphibole end-member fluoro-sodic-pedrizite sample from Tastyg spodumene deposit, Tuva, Siberia, Russia American Mineralogist 90 732-736 | | 2005 | 0 | 293 | |
| 0002418 | Tremolite | Merli M, Ungaretti L, Oberti R (2000) Leverage analysis and structure refinement of minerals American Mineralogist 85 532-542 | | 2000 | 0 | 293 | |
| 0002280 | Tremolite | Sharma A, Jenkins D M (1999) Hydrothermal synthesis of amphiboles along the tremolite-pargasite join and in the ternary system tremolite-pargasite-cummingtonite American Mineralogist 84 1304-1318 | | 1999 | 0 | 293 | |
| 0006601 | Tremolite | Oberti R, Ungaretti L, Cannillo E, Hawthorne F C, Memmi I (1995) Temperature-dependent Al order-disorder in the tetrahedral double chain of C2/m amphiboles European Journal of Mineralogy 7 1049-1063 | 1995 | 0 | 293 | ||
| 0006414 | Tremolite | Comodi P, Mellini M, Ungaretti L, Zanazzi P F (1991) Compressibility and high pressure structure refinement of tremolite, pargasite and glaucophane European Journal of Mineralogy 3 485-499 | 1991 | 0 | 293 | ||
| 0006413 | Tremolite | Comodi P, Mellini M, Ungaretti L, Zanazzi P F (1991) Compressibility and high pressure structure refinement of tremolite, pargasite and glaucophane European Journal of Mineralogy 3 485-499 | 1991 | 0 | 293 | ||
| 0005125 | Tremolite | Hawthorne F C, Grundy H D (1976) The crystal chemistry of the amphiboles: IV. X-ray and neutron refinements of the crystal structure of tremolite The Canadian Mineralogist 14 334-345 | | 1976 | 0 | 293 | |
| 0005124 | Tremolite | Hawthorne F C, Grundy H D (1976) The crystal chemistry of the amphiboles: IV. X-ray and neutron refinements of the crystal structure of tremolite The Canadian Mineralogist 14 334-345 | | 1976 | 0 | 293 | |
| 0000384 | Tremolite | Cameron M, Gibbs G V (1973) The crystal structure and bonding of fluor-tremolite: A comparison with hydroxyl tremolite American Mineralogist 58 879-888 | | 1973 | 0 | 293 | |
| 0018031 | Tremolite | Warren B (1930) The crystal structure and chemical composition of the monoclinic amphiboles. _cod_database_code 1011146 Zeitschrift fur Kristallographie 72 493-516 | 1930 | 0 | 293 | ||
| 0018086 | Tremolite | Warren B (1929) The structure of tremolite H2 Ca2 Mg5 (Si O3)8 _cod_database_code 1011222 Zeitschrift fur Kristallographie 72 42-57 | 1929 | 0 | 293 | ||
| 0001835 | Tremolite | Yang H, Evans B W (1996) X-ray structure refinements of tremolite at 140 and 295 K: Crystal chemistry and petrologic implications American Mineralogist 81 1117-1125 | | 1996 | 0 | 140 | |
| 0000368 | Tremolite | Sueno S, Cameron M, Papike J J, Prewitt C T (1973) The high temperature crystal chemistry of tremolite American Mineralogist 58 649-664 | | 1973 | 0 | 673 | |
| 0000369 | Tremolite | Sueno S, Cameron M, Papike J J, Prewitt C T (1973) The high temperature crystal chemistry of tremolite American Mineralogist 58 649-664 | | 1973 | 0 | 973 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Loading XRD data...
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.12 ร | (100) |
| 8.38 ร | (100) |
| 2.71 ร | (90) |
Geological EnvironmentHide
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Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-๐ alteration and/or metamorphism | |
| 31 : Thermally altered carbonate, phosphate, and iron formations | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Geological Setting:
A common rock-forming mineral in contact metamorphosed Ca+/-Mg siliceous carbonate sediments, regional greenschist to amphibolite facies metamorphosed mafic and ultramafic rocks and dolomitic rocks, many skarns and veins, and some metamorphic ore deposits. See Deer et al., 1997.
Type Occurrence of TremoliteHide
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Geological Setting of Type Material:
Dolomite marble
Synonyms of TremoliteHide
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Other Language Names for TremoliteHide
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Czech:Tremolit
Dutch:Tremoliet
Finnish:Tremoliitti
Hebrew:ืืจืืืืื
Italian:Tremolite
Japanese:้้็ณ
Polish:Tremolit
Portuguese:Tremolite
Russian:ะขัะตะผะพะปะธั
ะะฑั ะฐะทะธั
ะะฑั ะฐะทะธั
Simplified Chinese:้้ช็ณ
็บค็ปด็ถ้้ช็ณ
็บค็ปด็ถ้้ช็ณ
Slovak:Tremolit
Swedish:Grammatit
Varieties of TremoliteHide
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| Chrome-Tremolite | A Cr-bearing tremolite. |
| Chromium-bearing Tremolite | |
| Hexagonite | A Mn-bearing variety distinguished by its pale lilac to purplish color. Supposedly a hexagonal form of tremolite (hence the name), but shown to be monoclinic. Originally reported from Edwards, Balmat-Edwards Zinc District, St Lawrence Co., New York, USA. |
| Tremolitasbest | Fibrous (asbestiform) variety of tremolite. |
Relationship of Tremolite to other SpeciesHide
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Member of:
Other Members of Tremolite Root Name Group:
| Fluoro-tremolite | โปCa2Mg5(Si8O22)F2 | Mon. 2/m : B2/m |
Forms a series with:
Common AssociatesHide
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Associations Based on Photo Data:
| 170 photos of Tremolite associated with Calcite | CaCO3 |
| 97 photos of Tremolite associated with Quartz | SiO2 |
| 65 photos of Tremolite associated with Talc | Mg3Si4O10(OH)2 |
| 62 photos of Tremolite associated with Diopside | CaMgSi2O6 |
| 60 photos of Tremolite associated with Pyrite | FeS2 |
| 55 photos of Tremolite associated with Clino-suenoite | โปMn2+2(Mg5)(Si8O22)(OH)2 |
| 51 photos of Tremolite associated with Magnetite | Fe2+Fe3+2O4 |
| 37 photos of Tremolite associated with Dolomite | CaMg(CO3)2 |
| 36 photos of Tremolite associated with Fluor-uvite | CaMg3(Al5Mg)(Si6O18)(BO3)3(OH)3F |
| 34 photos of Tremolite associated with Anthophyllite | โปMg2Mg5(Si8O22)(OH)2 |
Related Minerals - Strunz-mindat GroupingHide
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| 9.DE. | Shojiite | Na(NaMg)Mg5Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE. | Clino-suenoite | โปMn2+2(Mg5)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE. | Mangani-eckermannite | NaNa2(Mg4Mn3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.05 | 'Permanganogrunerite' | โป{Mn2+2}{Mn2+5}(Si8O22)(OH)2 | Mon. |
| 9.DE.05 | Cummingtonite | โปMg2Mg5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.05 | Ferri-fluoro-leakeite | NaNa2(Mg2Fe3+2Li)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.05 | Grunerite | โปFe2+2Fe2+5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.05 | Clino-holmquistite Root Name Group | โปLi2(C2+3C3+2)(Si8O22)w2 | Mon. |
| 9.DE.10 | Actinolite | โปCa2(Mg4.5-2.5Fe0.5-2.5)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | Fluoro-cannilloite | CaCa2(Mg4Al)(Si5Al3)O22F2 | Mon. 2/m : B2/m |
| 9.DE.10 | Joesmithite | Pb2+Ca2(Mg3Fe3+2)(Si6Be2)O22(OH)2 | Mon. 2/m : P2/b |
| 9.DE.10 | Clino-ferro-suenoite | โปMn2+2(Fe2+5)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | Fluoro-tremolite | โปCa2Mg5(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.10 | 'Parvo-manganotremolite' | โป{CaMn2+}{Mg5}(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | Magnesio-ferri-hornblende | โปCa2(Mg4Fe3+)[(Si7Al)O22](OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | Ferro-ferri-hornblende | โปCa2(Fe2+4Fe3+)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | 'Ferro-cannilloite' | CaCa2(Fe2+4Al)(Si5Al3O22)OH2 | |
| 9.DE.10 | 'Ferro-ferri-cannilloite' | CaCa2(Fe2+4Fe3+)(Si5Al3O22)OH2 | |
| 9.DE.10 | 'Ferro-fluoro-actinolite' | โป{Ca2}{Fe5}(Si8O22)F2 | |
| 9.DE.10 | 'Ferro-fluoro-hornblende' | โปCa2(Fe2+4Al)(AlSi7O22)F2 | |
| 9.DE.10 | Magnesio-ferri-fluoro-hornblende | โปCa2(Mg4Fe3+)(AlSi7O22)F2 | Mon. 2/m : B2/m |
| 9.DE.10 | 'Ferro-ferri-fluoro-hornblende' | โปCa2(Fe2+4Fe3+)(AlSi7O22)F2 | |
| 9.DE.10 | 'Ferri-fluoro-tschermakite' | โป{Ca2}{Mg3Fe3+2}(Al2Si6O22)F2 | |
| 9.DE.10 | 'Ferro-ferri-fluoro-tschermakite' | โป{Ca2}{Fe2+3Fe3+2}(Al2Si6O22)F2 | |
| 9.DE.10 | 'Ferro-fluoro-tschermakite' | โป{Ca2}{Fe2+3Al2}(Al2Si6O22)F2 | |
| 9.DE.10 | 'Fluoro-tschermakite' | โป{Ca2}{Mg3Al2}(Al2Si6O22)F2 | |
| 9.DE.10 | 'Magnesio-fluoro-hornblende' | โปCa2(Mg4Al)(AlSi7O22)F2 | |
| 9.DE.10 | 'Ferro-ferri-tschermakite' | โป{Ca2}{Fe2+3Fe3+2}(Al2Si6O22)(OH)2 | Mon. |
| 9.DE.10 | 'Cannilloite' | CaCa2(Mg4Al)(Si5Al3O22)OH2 | Mon. |
| 9.DE.10 | Tschermakite | โปCa2(Mg3Al2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | Magnesio-hornblende | โปCa2(Mg4Al)(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | 'Ferri-tschermakite' | โปCa2(Mg3Fe3+2)(Al2Si6O22)(OH)2 | Mon. |
| 9.DE.10 | Ferro-actinolite | โปCa2Fe2+5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | Ferro-hornblende | โปCa2(Fe2+4Al)(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.10 | Ferro-tschermakite | โปCa2(Fe2+3Al2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-chloro-pargasite | KCa2(Mg4Al)(Si6Al2)O22Cl2 | Mon. 2/m : B2/m |
| 9.DE.15 | 'Ferro-fluoro-pargasite' | (Na)(Ca2)(Fe2+4Al)(Al2Si6O22)F2 | |
| 9.DE.15 | 'Potassic-ferro-chloro-edenite' | KCa2Fe2+5(AlSi7O22)Cl2 | |
| 9.DE.15 | 'Ferro-ferri-sadanagaite' | NaCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 | Mon. |
| 9.DE.15 | Hastingsite | NaCa2(Fe2+4Fe3+)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Fluoro-edenite | NaCa2Mg5(Si7Al)O22F2 | Mon. 2/m : P2/c |
| 9.DE.15 | Pargasite | NaCa2(Mg4Al)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Magnesio-fluoro-hastingsite | NaCa2(Mg4Fe3+)(Si6Al2)O22F2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-fluoro-hastingsite | KCa2(Fe2+4Fe3+)(Si6Al2)O22F2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-chloro-hastingsite | KCa2(Fe2+4Fe3+)(Si6Al2)O22Cl2 | Mon. 2/m : B2/m |
| 9.DE.15 | 'Unnamed (F-dominant analogue of Ferri-kaersutite)' | (Na,K)Ca2[Mg3(Fe3+,Fe2+)Ti](Si6Al2O22)(F,O)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Edenite | NaCa2Mg5(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-sadanagaite | KCa2(Mg3Al2)(Al3Si5O22)(OH)2 | Mon. 2 |
| 9.DE.15 | Ferri-kaersutite | NaCa2(Mg3Fe3+Ti)(Si6Al2O22)O2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-pargasite | KCa2(Mg4Al)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-ferro-sadanagaite | KCa2(Fe2+3Al2)(Al3Si5O22)(OH)2 | Mon. |
| 9.DE.15 | Kaersutite | NaCa2(Mg3AlTi4+)(Si6Al2)O22O2 | Mon. 2/m : B2/m |
| 9.DE.15 | 'Ferro-chloro-pargasite' | NaCa2(Fe2+4Al)(Al2Si6O22)Cl2 | |
| 9.DE.15 | Potassic-fluoro-pargasite | KCa2(Mg4Al)(Si6Al2)O22F2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-ferro-ferri-sadanagaite | KCa2(Fe2+3Fe3+2)(Al3Si5O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Fluoro-pargasite | NaCa2(Mg4Al)(Si6Al2)O22F2 | Mon. 2/m : B2/m |
| 9.DE.15 | 'Parvo-mangano-edenite' | {Na}{CaMn2+}{Mg5}(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Ferro-fluoro-edenite | NaCa2Fe2+5(AlSi7O22)F2 | Mon. 2/m : B2/m |
| 9.DE.15 | Mangani-pargasite | NaCa2(Mg4Mn3+)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Sadanagaite | NaCa2(Mg3Al2)(Si5Al3O22)(OH)2 | Mon. |
| 9.DE.15 | Magnesio-hastingsite | NaCa2(Mg4Fe3+)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | 'Ferri-sadanagaite' | NaCa2(Mg3Fe3+2)(Al3Si5O22)(OH)2 | |
| 9.DE.15 | 'Ferro-sadanagaite' | NaCa2(Fe3Al2)(Al3Si5O22)(OH)2 | |
| 9.DE.15 | 'Ferri-fluoro-sadanagaite' | {Na}{Ca2}{Mg3Fe3+2}(Al3Si5O22)F2 | |
| 9.DE.15 | 'Ferro-ferri-fluoro-sadanagaite' | {Na}{Ca2}{Fe2+3Fe3+2}(Al3Si5O22)F2 | |
| 9.DE.15 | 'Ferro-fluoro-sadanagaite' | {Na}{Ca2}{Fe2+3Al2}(Al3Si5O22)F2 | |
| 9.DE.15 | 'Fluoro-sadanagaite' | {Na}{Ca2}{Mg3Al2}(Al3Si5O22)F2 | |
| 9.DE.15 | 'Potassic-chloro-sadanagaite' | KCa2(Mg3Al2)(Al3Si5O22)Cl2 | |
| 9.DE.15 | 'Potassic-ferro-chloro-sadanagaite' | KCa2(Fe2+3Al2)(Al3Si5O22)Cl2 | |
| 9.DE.15 | Ferro-edenite | NaCa2Fe2+5(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Oxo-magnesio-hastingsite | NaCa2(Mg3(Fe3+2-x,Tix))5(Si6Al2O22)O2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-ferro-pargasite | KCa2(Fe2+4Al)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Potassic-hastingsite | KCa2(Fe2+4Fe3+)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | 'Fluoro-hastingsite' | NaCa2(Fe2+4Fe3+)(Al2Si6O22)F2 | |
| 9.DE.15 | Potassic-magnesio-hastingsite | KCa2(Mg4Fe3+)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Vanadio-pargasite | NaCa2(Mg3+4V)(Al2Si6)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | 'Ferro-kaersutite' | NaCa2(Fe2+3AlTi)(Si6Al2O22)O2 | Mon. |
| 9.DE.15 | Chromio-pargasite | NaCa2(Mg4Cr)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.15 | Ferro-pargasite | NaCa2(Fe2+4Al)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Ghoseite' | โป[Mn2+Na][Mg4Al]Si8O22(OH)2 | |
| 9.DE.20 | Potassic-ferro-taramite | K(CaNa)(Fe2+3Al2)(Si6Al2)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Ferri-fluoro-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)F2 | Mon. 2/m : B2/m |
| 9.DE.20 | Barroisite | โป(CaNa)(Mg3Al2)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Fluoro-richterite | Na(CaNa)Mg5(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.20 | Potassic-ferro-ferri-taramite | K(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Potassic-ferri-katophorite' | K(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2 | |
| 9.DE.20 | 'Potassic-ferro-richterite' | K(CaNa)Fe2+5(Si8O22)(OH)2 | |
| 9.DE.20 | Potassic-fluoro-richterite | K(CaNa)Mg5(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.20 | Potassic-richterite | K(CaNa)Mg5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Ferri-ghoseite | โป(Mn2+Na)(Mg4Fe3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Fluoro-taramite | Na(CaNa)(Mg3Al2)(Al2Si6O22)F2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Ferro-ferri-fluoro-katophorite' | Na(CaNa)(Fe2+4Fe3+)(AlSi7O22)F2 | Mon. |
| 9.DE.20 | Richterite | Na(CaNa)Mg5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Ferri-winchite | โป(NaCa)(Mg4Fe3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Fluoro-katophorite' | Na(CaNa)(Mg4Al)(AlSi7O22)F2 | Mon. |
| 9.DE.20 | Hjalmarite | Na(NaMn)Mg5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Ferro-taramite | Na(CaNa)(Fe2+3Al2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Clinoferroholmquistite' | โปLi2[Fe2+3Al2]Si8O22(OH,F)2 | |
| 9.DE.20 | Ferro-katophorite | Na(CaNa)(Fe2+4Al)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Taramite | Na(CaNa)(Mg3Al2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Potassic-fluoro-katophorite' | K(CaNa)(Mg4Al)(AlSi7O22)F2 | |
| 9.DE.20 | 'Ferro-fluoro-katophorite' | Na(CaNa)(Fe2+4Al)(AlSi7O22)F2 | |
| 9.DE.20 | Ferri-katophorite | Na(CaNa)(Mg4Fe3+)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Ferro-ferri-barroisite' | โป(CaNa)(Fe2+3Fe3+2)(AlSi7O22)(OH)2 | |
| 9.DE.20 | Ferri-taramite | Na(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Potassic-ferro-ferri-katophorite' | K(CaNa)(Fe2+4Fe3+)(AlSi7O22)(OH)2 | |
| 9.DE.20 | 'Ferro-ferri-winchite' | โป(CaNa)(Fe2+4Fe3+)Si8O22(OH)2 | |
| 9.DE.20 | Winchite | โป(CaNa)(Mg4Al)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Ferro-fluoro-richterite' | {Na}{CaNa}{Fe2+5}(Si8O22)F2 | |
| 9.DE.20 | 'Fluoro-winchite' | โป(CaNa)(Mg4Al)(Si8O22)F2 | |
| 9.DE.20 | 'Ferro-fluoro-winchite' | โป{CaNa}{Fe2+4Al}(Si8O22)F2 | |
| 9.DE.20 | 'Ferri-barroisite' | โป(CaNa)(Mg3Fe3+2)(AlSi7O22)(OH)2 | |
| 9.DE.20 | 'Ferro-ferri-taramite' | Na(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)(OH)2 | |
| 9.DE.20 | 'Ferri-fluoro-barroisite' | โป{CaNa}{Mg3Fe3+2}(AlSi7O22)F2 | |
| 9.DE.20 | 'Ferro-fluoro-barroisite' | โป{CaNa}{Fe2+3Al2}(AlSi7O22)F2 | |
| 9.DE.20 | 'Ferro-ferri-fluoro-barroisite' | โป{CaNa}{Fe2+3Fe3+2}(AlSi7O22)F2 | |
| 9.DE.20 | 'Fluoro-barroisite' | โป{CaNa}{Mg3Al2}(AlSi7O22)F2 | |
| 9.DE.20 | Ferro-ferri-katophorite | Na(NaCa)(Fe2+4Fe3+)(Si7Al)O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Ferri-fluoro-taramite' | Na(CaNa)(Mg3Fe3+2)(Al2Si6O22)F2 | |
| 9.DE.20 | 'Ferro-ferri-fluoro-taramite' | Na(CaNa)(Fe2+3Fe3+2)(Al2Si6O22)F2 | |
| 9.DE.20 | 'Ferro-fluoro-taramite' | Na(CaNa)(Fe2+3Al2)(Al2Si6O22)F2 | |
| 9.DE.20 | 'Potassic-ferri-taramite' | K(CaNa)(Mg3Fe3+2)(Al2Si6O22)(OH)2 | |
| 9.DE.20 | 'Magnesiotaramite' | {Na}{CaNa}{Mg3AlFe3+}(Al2Si6O22)(OH)2 | Mon. |
| 9.DE.20 | 'Ferro-barroisite' | โป(CaNa)(Fe2+3Al2)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Scandio-winchite | โป(NaCa)(Mg4Sc)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Ferro-richterite | Na(CaNa)Fe2+5(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | Katophorite | Na(CaNa){Mg4Al)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.20 | 'Ferro-winchite' | โป(CaNa)(Fe2+4Al)(Si8O22)(OH)2 | Mon. |
| 9.DE.25 | 'Clino-sodic-fluoro-holmquistite' | {Na}{Li2}{Mg4Al}(Si8O22)F2 | |
| 9.DE.25 | Ferro-ferri-nybรธite | NaNa2(Fe2+3,Mg)Fe3+2)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Clino-ferro-ferri-holmquistite | โปLi2(Fe2+3Fe3+2)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Oxo-pargasite' | NaCa2(Mg3(Al2-xTix))5(Si6Al2O22)O2 | |
| 9.DE.25 | 'Ferri-nybรธite' | NaNa2(Mg3Fe3+2)(AlSi7O22)(OH)2 | Mon. |
| 9.DE.25 | 'Ferro-ferri-leakeite' | NaNa2(Fe2+2Fe3+2Li)Si8O22(OH)2 | Mon. |
| 9.DE.25 | Ferro-ferri-fluoro-leakeite | NaNa2(Fe2+2Fe3+2Li)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.25 | Ferri-leakeite | NaNa2(Mg2Fe3+2Li)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Fluoro-pedrizite | NaLi2(Mg2Al2Li)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.25 | Eckermannite | NaNa2(Mg4Al}Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Arfvedsonite | NaNa2(Fe2+4Fe3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Mangano-ferri-fluoro-leakeite' | NaNa2(Mn2+2Fe3+2Li)(Si8O22)F2 | Mon. |
| 9.DE.25 | Ferri-obertiite | NaNa2(Mg3Fe3+Ti)Si8O22O2 | Mon. 2/m : B2/m |
| 9.DE.25 | Riebeckite | โปNa2(Fe2+3Fe3+2)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Unnamed (Possible K-analogue of Ferri-obertiite)' | KNa2((Mg,Fe,Na)3Fe3+(Ti,Fe))Si8O22(O,F)2 | |
| 9.DE.25 | Magnesio-fluoro-arfvedsonite | NaNa2(Mg4Fe3+)[Si8O22]F2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Ferro-fluoro-glaucophane' | โป[Na2][Fe2+3Al2]Si8O22F2 | |
| 9.DE.25 | Oxo-mangani-leakeite | NaNa2(Mn3+4Li)Si8O22O2 | Mon. 2/m : B2/m |
| 9.DE.25 | Fluoro-leakeite | NaNa2(Mg2Al2Li)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.25 | Nybรธite | NaNa2(Mg3Al2)(AlSi7O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Sodic-ferri-clinoferroholmquistite' | Na0.5{Li2}{Fe2+3Fe3+2}(Si8O22)(OH)2 | Mon. |
| 9.DE.25 | Potassic-arfvedsonite | KNa2(Fe2+4Fe3+)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Potassic-mangano-mangani-ungarettiite' | KNa2(Mn2+2Mn3+3)Si8O22O2 | |
| 9.DE.25 | Potassic-jeanlouisite | K(NaCa)(Mg4Ti)Si8O22O2 | Mon. 2/m : B2/m |
| 9.DE.25 | Ferri-pedrizite | NaLi2(Mg2Fe3+2Li)Si8O22(OH)2 | Mon. |
| 9.DE.25 | Glaucophane | โปNa2(Mg3Al2)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Ferro-fluoro-pedrizite | NaLi2(Fe2+2Al2Li)[Si8O22]F2 | Mon. 2/m : B2/m |
| 9.DE.25 | Potassic-ferri-leakeite | KNa2(Mg2Fe3+2Li)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Potassic-magnesio-fluoro-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.25 | Mangani-obertiite | NaNa2(Mg3Mn3+Ti4+)Si8O22O2 | Mon. 2/m : B2/m |
| 9.DE.25 | Scandio-fluoro-eckermannite | NaNa2(Mg4Sc)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Ferro-eckermannite' | NaNa2(Fe2+4Al)Si8O22(OH)2 | Mon. |
| 9.DE.25 | Ferro-ferri-pedrizite | NaLi2(Fe2+2Fe3+2Li)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Pedrizite' | NaLi2(LiMg2Al2)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Ferro-pedrizite | NaLi2(Fe2+2Al2Li)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Potassic-mangani-leakeite | KNa2(Mg2Mn3+2Li)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Clino-fluoro-holmquistite' | โป{Li2}{Mg3Al2}(Si8O22)F2 | |
| 9.DE.25 | Ferro-ferri-obertiite | NaNa2(Fe2+3Fe3+Ti)Si8O22O2 | Mon. 2/m : B2/m |
| 9.DE.25 | Magnesio-riebeckite | โปNa2(Mg3Fe3+2)(Si8O22)(OH)2 | Mon. |
| 9.DE.25 | Potassic-magnesio-arfvedsonite | KNa2(Mg4Fe3+)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Fluoro-nybรธite | NaNa2(Mg3Al2)(AlSi7O22)(F,OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | Mangano-ferri-eckermannite | NaNa2(Mn2+4Fe3+)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Fluoro-glaucophane' | โป[Na2][Mg3Al2]Si8O22F2 | |
| 9.DE.25 | Fluoro-riebeckite | โปNa2(Fe2+3Fe3+2)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.25 | Magnesio-fluoro-riebeckite | โปNa2(Mg3Fe3+2)(Si8O22)F2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Fluoro-eckermannite' | NaNa2(Mg4Al}Si8O22F2 | |
| 9.DE.25 | 'Ferro-fluoro-eckermannite' | NaNa2(Fe2+4Al}Si8O22F2 | |
| 9.DE.25 | 'Fluoro-arfvedsonite' | NaNa2(Fe2+4Fe3+)Si8O22F2 | |
| 9.DE.25 | Magnesio-arfvedsonite | NaNa2(Mg4Fe3+)(Si8O22)(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Ferri-fluoro-nybรธite' | NaNa2(Mg3Fe3+2)(AlSi7O22)F2 | |
| 9.DE.25 | 'Ferro-ferri-fluoro-nybรธite' | NaNa2(Fe2+3Fe3+2)(AlSi7O22)F2 | |
| 9.DE.25 | Ferro-glaucophane | โปNa2(Fe2+3Al2)Si8O22(OH)2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Ferro-fluoro-nybรธite' | NaNa2(Fe2+3Al2)(AlSi7O22)F2 | |
| 9.DE.25 | Mangani-dellaventuraite | NaNa2(MgMn3+2Ti4+Li)Si8O22O2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Ferro-leakeite' | NaNa2(Fe2+2Al2Li)(Si8O22)(OH)2 | |
| 9.DE.25 | 'Leakeite' | NaNa2(Mg2Al2Li)(Si8O22)(OH)2 | |
| 9.DE.25 | 'Potassic-leakeite' | KNa2(Mg2Al2Li)(Si8O22)(OH)2 | |
| 9.DE.25 | 'Ferri-fluoro-pedrizite' | NaLi2(LiMg2Fe3+2)(Si8O22)F2 | |
| 9.DE.25 | 'Ferro-ferri-fluoro-pedrizite' | NaLi2(LiFe2+2Fe3+2)(Si8O22)F2 | |
| 9.DE.25 | 'Ferro-nybรธite' | NaNa2(Fe2+3Al2)(AlSi7O22)(OH)2 | Mon. |
| 9.DE.25 | 'Clino-ferro-ferri-fluoro-holmquistite' | โป{Li2}{Fe2+3Fe3+2}(Si8O22)F2 | |
| 9.DE.25 | Mangano-mangani-ungarettiite | NaNa2(Mn2+2Mn3+3)(Si8O22)O2 | Mon. 2/m : B2/m |
| 9.DE.25 | 'Clino-ferri-fluoro-holmquistite' | โป{Li2}{Mg3Fe3+2}(Si8O22)F2 | |
| 9.DE.25 | 'Clino-ferro-fluoro-holmquistite' | โป{Li2}{Fe2+3Al2}(Si8O22)F2 |
Other InformationHide
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Health Risks:
Asbestiform varieties of tremolite can cause lung disease when inhaled, as with other species of asbestos minerals.
This mineral is known to be a respirable carcinogen, and is an uncommon form of asbestos. Exposure to very dusty air or long-term exposure to low level airborne dusts containing fine fibres of the mineral has been found to cause a high risk of serious lung disease including mesothelioma and lung cancer. Care should be taken working with samples that contain fibrous forms of this mineral, to avoid creating or inhaling dusts. Non-fibrous forms, such as in many amphibolites, are safer to handle, but can still produce potentially carcinogenic respirable fibre when crushed. Appropriate dust masks should be worn if working in areas which have dusts likely to be rich in this mineral. Storage and careful handling of specimens has little or no risk.
This mineral is known to be a respirable carcinogen, and is an uncommon form of asbestos. Exposure to very dusty air or long-term exposure to low level airborne dusts containing fine fibres of the mineral has been found to cause a high risk of serious lung disease including mesothelioma and lung cancer. Care should be taken working with samples that contain fibrous forms of this mineral, to avoid creating or inhaling dusts. Non-fibrous forms, such as in many amphibolites, are safer to handle, but can still produce potentially carcinogenic respirable fibre when crushed. Appropriate dust masks should be worn if working in areas which have dusts likely to be rich in this mineral. Storage and careful handling of specimens has little or no risk.
Tremolite in petrologyHide
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An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for TremoliteHide
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References for TremoliteHide
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Reference List:
SHIDO, Fumiko (1959) Notes on Rock-Forming Minerals (8) Chemical, Optical and X-Ray Data on a Tremolite and Three Actinolites. The Journal of the Geological Society of Japan, 65 (768) 563-565 doi:10.5575/geosoc.65.563
STEMPLE, IRENE S., BRINDLEY, G. W. (1960) A Structural Study of Talc and Talc-Tremolite Relations. Journal of the American Ceramic Society, 43 (1). 34-42 doi:10.1111/j.1151-2916.1960.tb09149.x
Metz, Paul (1967) Die obere Stabilitรคtsgrenze von Tremolit bei der Metamorphose von kieseligen Karbonaten. Contributions to Mineralogy and Petrology, 15 (3). 272-280 doi:10.1007/bf01185346
Ross, Malcolm, Smith, William L., Ashton, William H. (1968) Triclinic talc and associated amphiboles from Gouverneur mining district, New York. American Mineralogist, 53 (5-6) 751-769
Wilkins, R. W. T. (1970) Iron-magnesium distribution in the tremolite-actinolite series. American Mineralogist, 55 (11-12) 1993-1998
Abercrombie, H. J., Skippen, G. B., Marshall, D. D. (1987) F-OH substitution in natural tremolite, talc, and phlogopite. Contributions to Mineralogy and Petrology, 97 (3) 305-312 doi:10.1007/bf00371994
Damman, A. H., Lustenhouwer, W. J. (1992) Manganese-rich calcic amphiboles of the tremolite-ferro-actinolite series. Mineralogical Magazine, 56 (384) 391-398 doi:10.1180/minmag.1992.056.384.12
Chernosky, Joseph V., Berman, Robert G., Jenkins, David M. (1998) The stability of tremolite: new experimental data and a thermodynamic assessment. American Mineralogist, 83 (7). 726-739 doi:10.2138/am-1998-7-805
Evans, Bernard W., Yang, Hexiong (1998) Fe-Mg order-disorder in tremolite-actinolite-ferro-actinolite at ambient and high temperature. American Mineralogist, 83 (5) 458-475 doi:10.2138/am-1998-5-606
Gottschalk, M., Najorka, J., Andrut, M. (1998) Structural and compositional characterization of synthetic (Ca,Sr)-tremolite and (Ca,Sr)-diopside solid solutions. Physics and Chemistry of Minerals, 25 (6) 415-428 doi:10.1007/s002690050131
Hawthorne, Frank C., Welch, Mark D., Ventura, Giancarlo Della, Liu, Shuangxi, Robert, Jean-Louis, Jenkins, David M. (2000) Short-range order in synthetic aluminous tremolites: An infrared and triple-quantum MAS NMR study. American Mineralogist, 85 (11) 1716-1724 doi:10.2138/am-2000-11-1215
Verkouteren, Jennifer R., Wylie, Ann G. (2000) The tremolite-actinolite-ferroโactinolite series: Systematic relationships among cell parameters, composition, optical properties, and habit, and evidence of discontinuities. American Mineralogist, 85 (9) 1239-1254 doi:10.2138/am-2000-8-917
Andrut, M., Gottschalk, M., Melzer, S., Najorka, J. (2000) Lattice vibrational modes in synthetic tremolite-Sr-tremolite and tremolite-richterite solid solutions. Physics and Chemistry of Minerals, 27 (5) 301-309 doi:10.1007/s002690050259
Melzer, Stefan, Gottschalk, Matthias, Andrut, Michael, Heinrich, Wilhelm (2000) Crystal chemistry of K-richterite-richterite-tremolite solid solutions: a SEM, EMP, XRD, HRTEM and IR study. European Journal of Mineralogy, 12 (2) 273-291 doi:10.1127/ejm/12/2/0273
Ishida, Kiyotaka, Hawthorne, Frank C., Ando, Yumi (2002) Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series. American Mineralogist, 87 (7) 891-898 doi:10.2138/am-2002-0712
Verkouteren, Jennifer R., Wylie, Ann G. (2002) Anomalous optical properties of fibrous tremolite, actinolite, and ferro-actinolite. American Mineralogist, 87 (8) 1090-1095 doi:10.2138/am-2002-8-905
Ishida, Kiyotaka, Hawthorne, Frank C., Ando, Yumi (2002) Fine structure of infrared OH-stretching bands in natural and heat-treated amphiboles of the tremolite-ferro-actinolite series. American Mineralogist, 87 (7) 891-898 doi:10.2138/am-2002-0712
Najorka, J., Gottschalk, M. (2003) Crystal chemistry of tremolite-tschermakite solid solutions. Physics and Chemistry of Minerals, 30 (2) 108-124 doi:10.1007/s00269-002-0291-1
Hawthorne, F. C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist, 44 (1) 1-21 doi:10.2113/gscanmin.44.1.1
Bersani, Danilo, Andรฒ, Sergio, Scrocco, Laura, Gentile, Paolo, Salvioli-Mariani, Emma, Fornasini, Laura, Lottici, Pier Paolo (2019) Composition of Amphiboles in the TremoliteโFerroโActinolite Series by Raman Spectroscopy. Minerals, 9 (8). 491 doi:10.3390/min9080491
Militello, Gaia M., Sanguineti, Elisa, Gonzร lez, Adriรกn Yus, Gaggero, Laura (2020) Asbestos amphiboles: effects of comminution on tremolite and actinolite regulated and unregulated fibres. Episodes, 43 (3). 909-918 doi:10.18814/epiiugs/2020/0200s09
Ott, Jason N., Kalkan, Bora, Kunz, Martin, Berlanga, Genesis, Yuvali, Ali F., Williams, Quentin (2023) Structural behavior of C2/m tremolite to 40 GPa: A high-pressure single-crystal X-ray diffraction study. American Mineralogist: Journal of Earth and Planetary Materials, 108 (5) 903-914 doi:10.2138/am-2022-8278
Localities for TremoliteHide
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Showing 3,574 localities.
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The Locality ListShow
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- This locality has map coordinates listed.
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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.
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Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are ยฉ OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833โ844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: October 20, 2026 01:04:28 Page updated: October 10, 2026 15:56:36
Prince's Soapstone Quarry, Lafayette Station, Philadelphia County, Pennsylvania, USA