Laitakarite Mineral Data

Laitakarite Mineral Data +

General Laitakarite Information

Chemical Formula:

Bi4(Se,S)3

Composition:

Molecular Weight = 1,037.63 gm

Bismuth 80.56 % Bi

Selenium 17.12 % Se

Sulfur 2.32 % S

______

100.00 %

Empirical Formula:

Bi₄Se_2.25S_0.75

Environment:

In veinlets in quartz-anthophyllite-codierite-biotite rocks.

IMA Status:

Approved IMA 1959

Locality:

Orijärvi mine, Orijärvi, Finland. Link to MinDat.org Location Data.

Name Origin:

Named for Aarne Laitakari, Director, Geological Survey of Finland, who collected the original material.

Synonym:

ICSD 30319

PDF 28-176

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Laitakarite Crystallography

Axial Ratios:

a:c = 1:9.45088

Cell Dimensions:

a = 4.225, c = 39.93, Z = 3; V = 617.28 Den(Calc)= 8.37

Crystal System:

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

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

By Intensity(I/I_o): 2.246(1), 3.072(1), 2.112(0.8),

Physical Properties of Laitakarite

Cleavage:

[???] Perfect

Color:

Lead gray, Lead white.

Density:

8.12

Diaphaniety:

Opaque

Fracture:

Flexible - Flexible fragments.

Hardness:

2 - Gypsum

Luster:

Metallic

Streak:

grayish black

Optical Properties of Laitakarite

RL Anisotrophism:

Moderate, dark brownish gray.

RL Color:

Galena white.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Laitakarite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
400 nm	46.70	53.60
420 nm	46.60	53.80
440 nm	46.50	54.00
460 nm	46.20	54.10
480 nm	46.00	53.90
500 nm	45.70	53.40
520 nm	45.40	53.10
540 nm	45.00	53.00
560 nm	44.70	53.00
580 nm	44.30	52.80
600 nm	44.00	52.50
620 nm	43.70	52.00
640 nm	43.30	51.70
660 nm	43.00	51.10
680 nm	42.50	50.60
700 nm	42.10	50.00

**Calculated Relative Intensity Colors of Laitakarite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	200%
R₁
R₂

Calculated Properties of Laitakarite

Electron Density:

r_electron=6.78 gm/cc
note: r_Laitakarite=8.37 gm/cc.

Fermion Index

Fermion Index = 0.01318
Boson Index = 0.98682

Photoelectric:

PE_Laitakarite=1,614.52 barns/electron
U=PE_Laitakarite x r_electron=10952.70 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Laitakarite is Not Radioactive

Laitakarite Classification

Dana Class:

2.6.2.4 (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.11-20 II - Sulfides and sulphosalts

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

II/D.11 - Tetradymite group, Ikunolite - Joseite-B series

II/D.11-10 Ikunolite Bi4(S,Se)3 R 3m 3 2/m

II/D.11-20 Laitakarite Bi4(Se,S)3 R 3m 3 2/m

II/D.11-30 Joseite Bi4(S,Te)3 R 3m 3 2/m

II/D.11-35 Joseite-B Bi4(S,Te)3 R 3m 3 2/m

II/D.11-40 Pilsenite Bi4Te3 R 3m 3 2/m

Other Laitakarite Information

References:

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

See Also:

Links to other databases for Laitakarite :
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 - WWW-MINCRYST 13 -École des Mines de Paris

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Laitakarite

Bi4(Se,S)3
Dana No: 2.6.2.4 Strunz No: II/D.11-20
Locality:

Notes: