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
GUID
(UUID V4):
(UUID V4):
11334ebe-20f5-451f-921b-153d14691842
IMA Classification of Karchevskyite
Approved
IMA Formula:
Mg18Al9(OH)54Sr2(CO3)9(H2O)6(H3O)5
Approval year:
2005
First published:
2008
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 |
|---|---|---|
| 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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Low
Pleochroism:
Non-pleochroic
Comments:
Anomalously biaxial
Chemistry of Karchevskyite
Mindat Formula:
Mg18Al9(OH)54Sr2(CO3)9(H2O)6 (H3O)5
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) |
Comments:
Format: d/A, I, (hkl)
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 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., Tagovkina, M.A., Antonov, A.V., Bogdanova, A.N., and Krasnova, N.I. (2008) Karchevskyite, [Mg^18Al^9(OH)^54][Sr^2(CO^3,PO^4)^9(H^2O,H^3O)^11] a new mineral species of the layered double hydroxide family. Geology of Ore Deposits: 50: 556-564.
Synonyms of Karchevskyite
Relationship of Karchevskyite to other Species
Member of:
Other Members of this group:
| Akopovaite | Al4Li2(OH)12(CO3)(H2O)3 | Mon. 2/m : B2/m |
| Amoraite | Ca12Al6(OH)36(CO3)2(SO3) · 15H2O | Tric. 1 : P1 |
| Brugnatellite | Mg6Fe3+(CO3)(OH)13 · 4H2O | Hex. |
| Carbocalumite | Ca4Al2(OH)12(CO3) · 6H2O | Trig. 3m (3 2/m) : R3c |
| Coalingite | Mg10Fe3+2(OH)24[CO3] · 2H2O | Trig. 3m (3 2/m) : R3m |
| Cualstibite Group | M2R(OH)6[Sb5+(OH)6], where M = Zn, Ni, Cu and R = Al or Fe3+ | |
| Dritsite | Li2Al4(OH)12Cl2 · 3H2O | Hex. 6/mmm (6/m 2/m 2/m) : P63/mcm |
| Fougèrite Group | ||
| Glaucocerinite Group | ||
| Hydrocalumite Group | ||
| Hydrotalcite Group | M6R3+2(OH)16Z · 4H2O, where M=Mg, Fe, Ni, R3+ = Al, Cr, Co or Fe, and Z=CO3, Cl | |
| Mampsisite | Ca4Al2(CO3)(OH)12 · 5H2O | Tric. |
| Muskoxite | Mg7Fe4O13 · 10H2O | Trig. 3m (3 2/m) |
| Poellmannite | Ca6Al3(OH)18[Na(H2O)6](SO4)2 · 6H2O | Trig. 3 : R3 |
| Quintinite Group | ||
| UM1987-05-OH:AlCMg | Mg4Al2(OH)12(CO3,SO4) · 3H2O | |
| Wermlandite Group | M7R3+2(OH)18[Ca(H2O)6][SO4]2 · 6H2O, where = Mg, Fe, Zn and R= Al or Fe | |
| Woodwardite Group | May be considered a subgroup of the Hydrotalcite Group. |
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 | 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.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.10 | Artinite | Mg2(CO3)(OH)2 · 3H2O |
| 5.DA.10 | Indigirite | Mg2Al2(CO3)4(OH)2 · 15H2O |
| 5.DA.10 | Chlorartinite | Mg2(CO3)(OH)Cl · 2H2O |
| 5.DA.15 | Otwayite | Ni2(CO3)(OH)2 · H2O |
| 5.DA.15 | Zaratite | Ni3(CO3)(OH)4 · 4H2O ? |
| 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 | Caresite | Fe2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.40 | Quintinite | Mg4Al2(OH)12(CO3) · 3H2O |
| 5.DA.40 | Charmarite | Mn2+4Al2(OH)12[CO3] · 3H2O |
| 5.DA.40 | UM1987-05-OH:AlCMg | Mg4Al2(OH)12(CO3,SO4) · 3H2O |
| 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 | Chlormagaluminite | Mg4Al2(OH)12Cl2 · 3H2O |
| 5.DA.45 | Hydrotalcite-2H | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.45 | Pyroaurite-2H | Mg6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.45 | Zaccagnaite | Zn4Al2(OH)12[CO3] · 3H2O |
| 5.DA.45 | Liudongshengite | Zn4Cr2(OH)12(CO3) · 3H2O |
| 5.DA.50 | Comblainite | Ni4Co2(OH)12[CO3] · 3H2O |
| 5.DA.50 | Desautelsite | Mg6Mn3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Hydrotalcite | Mg6Al2(CO3)(OH)16 · 4H2O |
| 5.DA.50 | Pyroaurite | Mg6Fe3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Reevesite | Ni6Fe3+2(OH)16(CO3) · 4H2O |
| 5.DA.50 | Stichtite | Mg6Cr3+2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Takovite | Ni6Al2(OH)16[CO3] · 4H2O |
| 5.DA.50 | Kaznakhtite | Ni6Co3+2(CO3)(OH)16 · 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
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References for Karchevskyite
Localities for Karchevskyite
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, Murmansk Oblast, Russia