Babkinite Mineral Data

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.

Synonym:

IMA1994-030

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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:

TrigonalSpace 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

Diaphaniety:

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:

r_electron=6.55 gm/cc
note: r_Babkinite=8.07 gm/cc.

Fermion Index

Fermion Index = 0.10053
Boson Index = 0.89947

Photoelectric:

PE_Babkinite=1,659.87 barns/electron
U=PE_Babkinite x r_electron=10875.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Babkinite is Not Radioactive

Babkinite Classification

Dana Class:

2.6.2.8 (2)Sulfides - Including Selenides and Tellurides

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

(2.6.2)Joseite Group (Trigonal: R3¯m)

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

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

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

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

2.6.2.5 Pilsenite Bi4Te3 R 3m 3 2/m

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

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

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

Strunz Class:

II/D.12-60 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 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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Babkinite

Pb2Bi2(S,Se)3
Dana No: 2.6.2.8 Strunz No: II/D.12-60
Locality:

Notes: