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 % Al₂O₃

Phosphorus 0.57 % P 1.30 % P₂O₅

Hydrogen 3.20 % H 28.60 % H₂O

Carbon 3.96 % C 14.50 % CO₂

Oxygen 58.28 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Mg₁₈Al₉OH₅₄Sr_1.79Mg_0.48Ca_0.09(CO₃)_8.26(PO₄)_0.46(H₂O)_6.54(H₃O)_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 31m, P 3₁m, P 3₁2

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_{Karchevskyite}= 7.36 barns/electron
U=PE_{Karchevskyite} x rElectron 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 31m, P 3₁m, P 3₁2 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 31m, P 3₁m, P 3₁2 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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