Mineralogy Database

Kochkarite Mineral Data

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General Kochkarite Information

Help on Chemical  Formula: Chemical Formula: PbBi4Te7
Help on Composition: Composition: Molecular Weight = 1,936.32 gm
   Bismuth    43.17 %  Bi
   Tellurium  46.13 %  Te
   Lead       10.70 %  Pb
             100.00 % 
Help on Empirical Formula: Empirical Formula: PbBi4Te7
Help on IMA Status: IMA Status: Approved IMA 1989
Help on Locality: Locality: Kochkar deposit, Ural Mountains, Russia Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the locality.
Help on Name Pronunciation: Name Pronunciation: Kochkarite + Pronunciation Say KOCHKARITE
Help on Synonym: Synonym: ICSD 30395
  PDF 44-1439

Kochkarite Image

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Comments: Bright silvery veinlets of kochkarite throughout matrix.
Location: Kochkar' Au deposit, Plast, Urals Region, Russia. Scale: Overall: 2.5 x 2 x 1.5 cm.
© Tom Loomis / Dakota Matrix

Kochkarite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:16.32472
Help on Cell Dimensions: Cell Dimensions: a = 4.416, c = 72.09, Z = 3; V = 1,217.49 Den(Calc)= 7.92
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: P 3m1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.228(1), 2.364(0.58), 2.005(0.33),

Physical Properties of Kochkarite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Silver gray.
Help on Density: Density: 7.89
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 2-2.5 - Gypsum-Finger Nail
Help on Luster: Luster: Metallic
Help on Streak: Streak: lead gray

Calculated Properties of Kochkarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.36 gm/cc
note: Specific Gravity of Kochkarite =7.92 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEKochkarite =1,245.01 barns/electron
U=PEKochkarite x rElectron Density=7,923.71 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Kochkarite is Not Radioactive

Kochkarite Classification

Help on  Dana Class: Dana Class: (02)Sulfides - Including Selenides and Tellurides
  (02.06)where Am Bn Xp, with (m+n):p=4:3
  (02.06.03)Kochkarite Group Kochkarite PbBi4Te7 P 3m1 3 2/m Aleksite PbBi2Te2S2(?) P 3m1 3 2/m Hedleyite Bi7Te3(?) R 3m 3 2/m
Help on  Strunz Class: Strunz Class: 02.GC.40b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
  02.G - Sulfarsenites, sulfantimonites, sulfbismuthites
  02.GC -Poly-sulfarsenites
02.GC.40b Kochkarite PbBi4Te7 P 3m1 3 2/m

Other Kochkarite Information

Help on References: References: PHYS. PROP.(Am.Min.,Vol.76,p1434,1991)
Help on See Also: See Also: Links to other databases for Kochkarite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 02.GC.40b





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