Babkinite Mineral Data

General Babkinite Information

Chemical Formula:

Pb2Bi2(S,Se)3

Composition:

Molecular Weight = 975.45 gm

Bismuth 42.85 % Bi

Lead 42.48 % Pb

Selenium 8.09 % Se

Sulfur 6.57 % S

______

100.00 %

Empirical Formula:

Pb₂Bi₂S₂Se

Environment:

High temperature Sn-W sulfide deposits.

IMA Status:

Approved IMA 1994 (Dana # Added)

Locality:

The Nevskoye deposit in northeastern Russia, 400 km northwest of Magadan, 25 km northwest of Omskukchan and 35 km southwest of the Dukat gold-silver deposit. Link to MinDat.org Location Data.

Name Origin:

For P. V. Babkin (1929-1977), noted Russian Geologist and the first investigator of the Nevskoye deposit.

Name Pronunciation:

Babkinite + Pronunciation

Synonym:

IMA1994-030

Babkinite Crystallography

Axial Ratios:

a:c = 1:9.44881

Cell Dimensions:

a = 4.191, c = 39.6, Z = 3; V = 602.37 Den(Calc)= 8.07

Crystal System:

Trigonal Space Group: P 3,P 3m

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

By Intensity(I/I_o): 3.04(1), 2.096(0.8), 1.298(0.7),1.806(0.6), 1.233(0.6), 3.42(0.5),

Physical Properties of Babkinite

Cleavage:

{001} Perfect

Color:

Silvery gray.

Density:

8.09

Diaphaneity:

Opaque

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

gray

Optical Properties of Babkinite

Optical Data:

NCalc= 2.08 - from Gladstone-Dale relationship (KC = 0.134) where Ncalc=Dcalc*KC+1
NCalc= 2.08 - from Gladstone-Dale relationship (KC = 0.134) where Ncalc=Dmeas*KC+1

RL Anisotrophism:

Distinct.

RL Bireflectance:

Almost absent.

RL Color:

Yellowish white.

RL Pleochroism:

Weak, bluish brown tints.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Babkinite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	49.70	48.50
546 nm	48.40	47.40
589 nm	47.90	46.80
650 nm	47.90	46.20

**Calculated Relative Intensity Colors of Babkinite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Babkinite

Electron Density:

Bulk Density (Electron Density)=6.55 gm/cc
note: Specific Gravity of Babkinite =8.07 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Babkinite=1,659.87 barns/electron
U=PE_Babkinite x rElectron Density=10875.96 barns/cc.

Radioactivity:

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

Babkinite Classification

Dana Class:

02.06.02.08 (02)Sulfides - Including Selenides and Tellurides

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

(02.06.02)Joseite Group (Trigonal: R-3m)

02.06.02.01 Joseite Bi4(S,Te)3 R 3m 3 2/m

02.06.02.02 Joseite-B Bi4(S,Te)3 R 3m 3 2/m

02.06.02.03 Ikunolite Bi4(S,Se)3 R 3m 3 2/m

02.06.02.04 Laitakarite Bi4(Se,S)3 R 3m 3 2/m

02.06.02.05 Pilsenite Bi4Te3 R 3m 3 2/m

02.06.02.06 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m

02.06.02.07 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m

02.06.02.08 Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig

Strunz Class:

02.GC.40e 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.G - Sulfarsenites, sulfantimonites, sulfbismuthites

02.GC -Poly-sulfarsenites

02.GC.40e Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig

Other Babkinite Information

References:

NAME( Am.Min.,Vol.81,p1513,1996) PHYS. PROP.(Am.Min.,Vol.81,p1513,1996) OPTIC PROP.(MinRec, v 28, p 219)

See Also:

Links to other databases for Babkinite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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

Babkinite

Pb2Bi2(S,Se)3
Dana No: 02.06.02.08 Strunz No: 02.GC.40e
Locality:

Notes:

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