Kochkarite Mineral Data

Kochkarite Mineral Data +

General Kochkarite Information

Chemical Formula:

PbBi4Te7

Composition:

Molecular Weight = 1,936.32 gm

Bismuth 43.17 % Bi

Tellurium 46.13 % Te

Lead 10.70 % Pb

______

100.00 %

Empirical Formula:

PbBi₄Te₇

IMA Status:

Approved IMA 1989

Locality:

Kochkar deposit, Ural Mountains, Russia Link to MinDat.org Location Data.

Name Origin:

Named after the locality.

Synonym:

ICSD 30395

PDF 44-1439

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Kochkarite Crystallography

Axial Ratios:

a:c = 1:16.32472

Cell Dimensions:

a = 4.416, c = 72.09, Z = 3; V = 1,217.49 Den(Calc)= 7.92

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: P 3m1

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

By Intensity(I/I_o): 3.228(1), 2.364(0.58), 2.005(0.33),

Physical Properties of Kochkarite

Cleavage:

[???] Perfect

Color:

Silver gray.

Density:

7.89

Diaphaniety:

Opaque

Hardness:

2-2.5 - Gypsum-Finger Nail

Luster:

Metallic

Streak:

lead gray

Calculated Properties of Kochkarite

Electron Density:

r_electron=6.36 gm/cc
note: r_Kochkarite=7.92 gm/cc.

Fermion Index

Fermion Index = 0.0605
Boson Index = 0.9395

Photoelectric:

PE_Kochkarite=1,245.01 barns/electron
U=PE_Kochkarite x r_electron=7,923.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Kochkarite is Not Radioactive

Kochkarite Classification

Dana Class:

2.6.3.1 (2)Sulfides - Including Selenides and Tellurides

(2.6)where Am Bn Xp, with (m+n):p=4:3

(2.6.3)Dana Group

2.6.3.1 Kochkarite PbBi4Te7 P 3m1 3 2/m

2.6.3.2 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

2.6.3.3 Hedleyite Bi7Te3(?) R 3m 3 2/m

Strunz Class:

II/D.12-10 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.12 - Tetradymite group, Poubaite - Rucklidgeite series

II/D.12-10 Kochkarite PbBi4Te7 P 3m1 3 2/m

II/D.12-20 Aleksite PbBi2Te2S2(?) P 3m1 3 2/m

II/D.12-30 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m

II/D.12-40 Platynite? (Bi,Pb)3(Se,S)4 R 3m 3 2/m

II/D.12-50 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m

II/D.12-55 Saddlebackite! Pb2Bi2Te2S3 Unk Hex

II/D.12-60 Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig

Other Kochkarite Information

References:

PHYS. PROP.(Am.Min.,Vol.76,p1434,1991)

See Also:

Links to other databases for Kochkarite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Kochkarite Specimen Label here :

Kochkarite

PbBi4Te7
Dana No: 2.6.3.1 Strunz No: II/D.12-10
Locality:

Notes: