Karchevskyite Mineral Data
General Karchevskyite Information
Chemical Formula:
[Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11]
Composition:
Molecular Weight = 2,507.53 gm
Strontium 6.25 % Sr 7.40 % SrO
Calcium 0.14 % Ca 0.20 % CaO
Magnesium 17.91 % Mg 29.70 % MgO
Aluminum 9.68 % Al 18.30 % Al2 O3
Phosphorus 0.57 % P 1.30 % P2 O5
Hydrogen 3.20 % H 28.60 % H2 O
Carbon 3.96 % C 14.50 % CO2
Oxygen 58.28 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mg18 Al9 OH54 Sr1.79 Mg0.48 Ca0.09 (CO3 )8.26 (PO4 )0.46 (H2 O)6.54 (H3 O)4.18
Environment:
Late-stage hydrothermal mineral in an Iron open pit. Layered double hydroxide.
IMA Status:
Approved IMA 2005 (Dana # Added)
Locality:
Zhelezny mine, Kovdor carbonatite massif, Kola Peninsula, Russia Link to MinDat.org Location Data.
Name Origin:
Named for Pavel Karchevsky (1976-2002), Russian mineralogist who made a significant contribution to the study of carbonatites.
Synonym:
IMA2005-015a
Karchevskyite Image
Images:
Karchevskyite
Comments: Colorless hexagonal plates of karchevskyite, co-type material, associated with phlogopite, dolomite, pyrite, and magnetite.
Location: Zheleznyi mine, Kovdor Massif, Kola Peninsula, Russia.
Scale: See Image.
© Rruff Database
Karchevskyite Crystallography
Axial Ratios:
a:c = 1:1.59825
Cell Dimensions:
a = 16.055, c = 25.66, Z = 3; V = 5,728.07 Den(Calc)= 2.18
Crystal System:
Trigonal Space Group: P 3, P 3 1m, P 31 m, P 31 2
X Ray Diffraction:
By Intensity(I/Io ): 8.52(1), 3.547(0.9), 3.665(0.9), 3.081(0.6), 4.27(0.6), 6.41(0.6), 5.13(0.3), 2.513(0.1),
Physical Properties of Karchevskyite
Cleavage:
{001} Perfect
Color:
White, Colorless.
Density:
2.21
Diaphaneity:
Transparent
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Platy - Sheet forms (e.g. micas).
Habit:
Spherical - Spherical, rounded aggregates.
Hardness:
2 - Gypsum
Luster:
Vitreous - Pearly
Streak:
white
Optical Properties of Karchevskyite
Gladstone-Dale:
CI meas = -0.02 (Excellent) - where the CI = (1-KPDmeas /KC ) CI calc = -0.034 (Excellent) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.2468,KPDmeas = 0.2434,KC = 0.2386 Ncalc = 1.52 - 1.53
Optical Data:
Uniaxial (-), e=1.534, w=1.542, bire=0.0080.
Calculated Properties of Karchevskyite
Electron Density:
Bulk Density (Electron Density)=2.25 gm/cc note: Specific Gravity of Karchevskyite =2.21 gm/cc.
Fermion Index:
Fermion Index = 0.02 Boson Index = 0.98
Photoelectric:
PEKarchevskyite = 7.36 barns/electronU=PEKarchevskyite x r Electron Density= 16.54 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Karchevskyite is Not Radioactive
Karchevskyite Classification
Dana Class:
06.04.15.01 (06) Hydroxides and Oxides Containing Hydroxyl
(06.04) containing multiple cations
(06.04.15) Dana Group
06.04.15.01 Karchevskyite ! [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11] P 3, P 3 1m, P 31 m, P 31 2 Trig
Strunz Class:
05.DA.60 05 - CARBONATES (NITRATES)
05.D - Carbonates with Additional Anions, with H2O
05.DA -With medium-sized cations
05.DA.60 Karchevskyite ! [Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11] P 3, P 3 1m, P 31 m, P 31 2 Trig
Other Karchevskyite Information
References:
NAME( Geology of Ore Deposits, v50:556) PHYS. PROP.(Geology of Ore Deposits, v50:556) OPTIC PROP.(Geology of Ore Deposits, v50:556)
See Also:
Links to other databases for Karchevskyite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Karchevskyite
[Mg18Al9(OH)54][Sr2(CO3,PO4)9(H2O,H3O)11]
Dana No: 06.04.15.01 Strunz No: 05.DA.60
Locality:
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