Betekhtinite Mineral Data

General Betekhtinite Information

Chemical Formula:

Cu10(Fe,Pb)S6

Composition:

Molecular Weight = 923.52 gm

Iron 3.63 % Fe

Copper 68.81 % Cu

Lead 6.73 % Pb

Sulfur 20.83 % S

______

100.00 %

Empirical Formula:

Cu₁₀Fe²⁺_0.6Pb_0.3S₆

Environment:

In veins cutting the black cupriferous shale at Mansfeld, Germany.

IMA Status:

Valid Species (Pre-IMA) 1955

Locality:

From the Mansfeld Kupferschiefer, Eisleben, and at Waschenback, Odenwald, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Anatolii Gergievich Betekhtin (1897-119620, Russian mineralogist and economic geologist.

Name Pronunciation:

Betekhtinite + Pronunciation

Synonym:

ICSD 26494

PDF 25-1223

Betekhtinite Image

Images:

Betekhtinite

Comments: Black crystalline aggregate of betekhtinite with white calcite.
Location: Twin Pocket, Mine #57, Dzhezkazgan, Kazakhstan. Scale: 9.5 x 7.5 cm.
© Fabre Minerals

Betekhtinite Crystallography

Axial Ratios:

a:b:c =0.6466:1:0.1699

Cell Dimensions:

a = 14.693, b = 22.72, c = 3.861, Z = 5; V = 1,288.90 Den(Calc)= 5.95

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: I mmm

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

By Intensity(I/I_o): 1.832(1), 2.93(0.9), 3.08(0.8),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Dornberger-Schiff K , Hohne E , Acta Crystallographica , 12 (1959) p.646-651, Die kristallstruktur des betechtinit Pb2(Cu,Fe)21S15

Physical Properties of Betekhtinite

Cleavage:

{???} Distinct, {???} Distinct, {???} Distinct

Color:

Brownish black.

Density:

5.96 - 6.05, Average = 6

Diaphaneity:

Opaque

Habit:

Acicular - Occurs as needle-like crystals.

Hardness:

3 - Calcite

Luster:

Metallic

Streak:

black

Optical Properties of Betekhtinite

RL Anisotrophism:

Strong, distinctly colored.

RL Color:

Bright cream parallel to elongation, stronger yellowish cream perpendicular.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Betekhtinite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	34.00	35.40
420 nm	33.70	34.60
440 nm	33.40	33.80
460 nm	33.20	33.30
480 nm	32.90	33.00
500 nm	32.80	32.60
520 nm	32.60	32.30
540 nm	32.50	32.10
560 nm	32.30	32.00
580 nm	32.00	31.80
600 nm	31.80	31.80
620 nm	31.60	31.90
640 nm	31.40	32.20
660 nm	31.40	32.40
680 nm	31.20	32.40
700 nm	31.20	32.40

**Calculated Relative Intensity Colors of Betekhtinite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%	240%	270%	280%
R₁
R₂

Calculated Properties of Betekhtinite

Electron Density:

Bulk Density (Electron Density)=5.49 gm/cc
note: Specific Gravity of Betekhtinite =5.95 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Betekhtinite= 145.58 barns/electron
U=PE_Betekhtinite x rElectron Density= 799.50 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Betekhtinite is Not Radioactive

Betekhtinite Classification

Dana Class:

02.16.08.01 (02)Sulfides - Including Selenides and Tellurides

(02.16)with miscellaneous formulae

(02.16.08)Dana Group

02.16.08.01 Betekhtinite Cu10(Fe,Pb)S6 I mmm 2/m 2/m 2/m

Strunz Class:

02.BE.05 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.B - Metal Sulfides, M:S > 1:1 (mainly 2:1)

02.BE -With Pb(Bi)

02.BE.05 Betekhtinite Cu10(Fe,Pb)S6 I mmm 2/m 2/m 2/m

Other Betekhtinite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Betekhtinite :
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 - HyperPhysics
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Ask about Betekhtinite here :
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Print or Cut-and-Paste your Betekhtinite Specimen Label here :

Betekhtinite

Cu10(Fe,Pb)S6
Dana No: 02.16.08.01 Strunz No: 02.BE.05
Locality:

Notes: