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Karchevskyite
A valid IMA mineral species
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About Karchevskyite
Pavel I. Karchevsky
Formula:
Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5
Colour:
Colourless to white
Lustre:
Vitreous, Pearly
Hardness:
2
Specific Gravity:
2.21
Crystal System:
Trigonal
Member of:
Name:
Named in honor of Pavel Ivanovich Karchevsky (Павел Иванович Карчевский) (1976-2002), Russian mineralogist, for his contributions to study of carbonatite massifs.
Belongs to hydrotalcite-like layered double hydroxides.
Unique Identifiers
Mindat ID:
27438
Long-form identifier:
mindat:1:1:27438:2
IMA Classification of Karchevskyite
Approved
Approval year:
2005
First published:
2008
Type description reference:
Britvin, S. N., Chukanov, N. V., Bekenova, G. K., Yagovkina, M. A., Antonov, A. V., Bogdanova, A. N., Krasnova, N. I. (2008) Karchevskyite, [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11], a new mineral species of the layered double hydroxide family. Geology of Ore Deposits, 50 (7). 556-564 doi:10.1134/s1075701508070064
Classification of Karchevskyite
5.DA.40
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
A : With medium-sized cations
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Kcv | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Karchevskyite
Vitreous, Pearly
Transparency:
Transparent
Comment:
pearly on cleavage surfaces
Colour:
Colourless to white
Hardness:
2 on Mohs scale
Tenacity:
Flexible
Cleavage:
Perfect
on {001}
on {001}
Density:
2.21(2) g/cm3 (Measured) 2.18(1) g/cm3 (Calculated)
Optical Data of Karchevskyite
Type:
Uniaxial (-)
RI values:
nω = 1.542(2) nε = 1.534(2)
2V:
Measured: 20°
Max. Birefringence:
δ = 0.008
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 µm 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 µm 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:
None to Very Low
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:
Non-pleochroic
Comments:
Anomalously biaxial
Chemistry of Karchevskyite
Mindat Formula:
Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5
Element Weights:
Crystallography of Karchevskyite
Crystal System:
Trigonal
Cell Parameters:
a = 16.055(6) Å, c = 25.66(1) Å
Ratio:
a:c = 1 : 1.598
Unit Cell V:
5728 ų
Z:
3
Comment:
Point Group: n.d; Space Group: P3 , P3, P3 1m, P31m, P3 m1, P3m1, P312, or P321.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.52 Å | (100) |
| 6.41 Å | (40) |
| 5.13 Å | (30) |
| 4.27 Å | (60) |
| 3.665 Å | (90) |
| 3.547 Å | (90) |
| 3.081 Å | (60) |
Reference:
Britvin, S. N., Chukanov, N. V., Bekenova, G. K., Yagovkina, M. A., Antonov, A. V., Bogdanova, A. N., Krasnova, N. I. (2008) Karchevskyite, [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11], a new mineral species of the layered double hydroxide family. Geology of Ore Deposits, 50 (7). 556-564 doi:10.1134/s1075701508070064
Comments:
Format: d/A, I, (hkl)
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-? subsurface aqueous alteration (see also #23) | |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Karchevskyite
General Appearance of Type Material:
spherulites up to 1 mm in diameter, composed of thin bended ductile plates
Place of Conservation of Type Material:
Mineralogical Museum, Department of Mineralogy, St. Petersburg State University, Russia.
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow.
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow.
Geological Setting of Type Material:
late-stage hydrothermal environment
Associated Minerals at Type Locality:
Reference:
Britvin, S. N., Chukanov, N. V., Bekenova, G. K., Yagovkina, M. A., Antonov, A. V., Bogdanova, A. N., Krasnova, N. I. (2008) Karchevskyite, [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11], a new mineral species of the layered double hydroxide family. Geology of Ore Deposits, 50 (7). 556-564 doi:10.1134/s1075701508070064
Synonyms of Karchevskyite
Other Language Names for Karchevskyite
Dutch:Karchevskyiet
German:Karchevskyit
Relationship of Karchevskyite to other Species
Member of:
Other Members of Wermlandite Group:
| Erssonite | Mg7Fe3+2(OH)18[Ca(H2O)6](SO4)2 · 12H2O | Trig. 3m(32/m) : P3c1 |
| Motukoreaite | Mg6Al3(OH)18[Na(H2O)6][SO4]2 · 6H2O | Trig. 3m(32/m) : R3m |
| Natroglaucocerinite | Zn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Hex. |
| Nikischerite | Fe2+6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. 3 : R3 |
| Shigaite | Mn6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. 3 : R3 |
| Wermlandite | Mg7Al2(OH)18[Ca(H2O)6][SO4]2 · 6H2O | Trig. 3m(32/m) : P3c1 |
Related Minerals - Strunz-mindat Grouping
| 5.DA. | Alexkhomyakovite | K6(Ca2Na)(CO3)5Cl · 6H2O |
| 5.DA. | Amoraite | Ca12Al6(OH)36(CO3)2(SO3) · 15H2O |
| 5.DA.05 | Dypingite | Mg5(CO3)4(OH)2 · 5H2O |
| 5.DA.05 | 'UM1986-10-CO:ClHMgMnZn (also called Mineral F, Dunn, 1995)' | Mg5(Zn,Mn)3(CO3)2(OH,Cl)12 · H2O |
| 5.DA.05 | 'UM1987-01-CO:HMgS' | Mg4(CO3)2(OH)4 · 6H2O ? |
| 5.DA.05 | Giorgiosite | Mg5(CO3)4(OH)2 · 5-6H2O |
| 5.DA.05 | Hydromagnesite | Mg5(CO3)4(OH)2 · 4H2O |
| 5.DA.05 | Widgiemoolthalite | Ni5(CO3)4(OH)2 · 5H2O |
| 5.DA.10 | Artinite | Mg2(CO3)(OH)2 · 3H2O |
| 5.DA.10 | Chlorartinite | Mg2(CO3)(OH)Cl · 2H2O |
| 5.DA.10 | Indigirite | Mg2Al2(CO3)4(OH)2 · 15H2O |
| 5.DA.15 | Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| 5.DA.15 | Otwayite | Ni2(CO3)(OH)2 · H2O |
| 5.DA.20 | Kambaldaite | NaNi4(CO3)3(OH)3 · 3H2O |
| 5.DA.25 | Callaghanite | Cu2Mg2(CO3)(OH)6 · 2H2O |
| 5.DA.30 | Claraite | (Cu,Zn)15(CO3)4(AsO4)2(SO4)(OH)14 · 7H2O |
| 5.DA.35 | Hydroscarbroite | Al14(CO3)3(OH)36 · nH2O |
| 5.DA.35 | Scarbroite | Al5(CO3)(OH)13 · 5H2O |
| 5.DA.40 | 'UM1987-05-OH:AlCMg' | Mg4Al2(OH)12(CO3,SO4) · 3H2O |
| 5.DA.40 | Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
| 5.DA.40 | Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.40 | Caresite | Fe2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Hydrotalcite-2H' | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | 'Stichtite-2H' | Mg6(Cr,Al)2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | Brugnatellite | Mg6Fe3+(CO3)(OH)13 · 4H2O |
| 5.DA.45 | Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | 'Pyroaurite-2H' | Mg6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.45 | Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O |
| 5.DA.45 | Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O |
| 5.DA.50 | Pyroaurite | Mg6Fe3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Takovite | Ni6Al2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Reevesite | Ni6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.50 | Kaznakhtite | Ni6Co3+2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Comblainite | Ni4Co2(OH)12[CO3] · 3H2O |
| 5.DA.50 | Marioantofilliite | [Cu4Al2(OH)12](CO3) · 3H2O |
| 5.DA.50 | Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Stichtite | Mg6Cr3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O |
| 5.DA.55 | Coalingite | Mg10Fe3+2(OH)24[CO3] · 2H2O |
| 5.DA.55 | Akopovaite | Al4Li2(OH)12(CO3)(H2O)3 |
| 5.DA.60 | Šlikite | Zn2Mg(CO3)2(OH)2 · 4H2O |
| 5.DA.65 | Marklite | Cu5(CO3)2(OH)6 · 6H2O |
Fluorescence of Karchevskyite
none
Other Information
IR Spectrum:
wave numbers in 1/cm (s: shoulder):
3470, 3420 s, 3035, 2960s, 1650, 1426, 1366 (quintinite impurity), 1024, 937, 860, 779, 678, 615s, 553, 449, 386
3470, 3420 s, 3035, 2960s, 1650, 1426, 1366 (quintinite impurity), 1024, 937, 860, 779, 678, 615s, 553, 449, 386
Thermal Behaviour:
Thermogravimetric Analysis (TGA):
- 12.2 wt.-% (230°C)
- 6.1 wt.-% (320°C)
- 23.7 wt.-% (440°C)
corresponding to a total weight loss of 42.0 wt.-%
- 12.2 wt.-% (230°C)
- 6.1 wt.-% (320°C)
- 23.7 wt.-% (440°C)
corresponding to a total weight loss of 42.0 wt.-%
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 Karchevskyite
mindat.org URL:
https://www.mindat.org/min-27438.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Karchevskyite
Reference List:
Britvin, S. N., Chukanov, N. V., Bekenova, G. K., Yagovkina, M. A., Antonov, A. V., Bogdanova, A. N., Krasnova, N. I. (2008) Karchevskyite, [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11], a new mineral species of the layered double hydroxide family. Geology of Ore Deposits, 50 (7). 556-564 doi:10.1134/s1075701508070064
Localities for Karchevskyite
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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.
Russia (TL) | |
| Britvin et al. (2008) |
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Kovdor Zheleznyi Mine, Kovdor Massif, Kovdorsky District, Murmansk Oblast, Russia