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.

Name Pronunciation:

Laitakarite + Pronunciation

Synonym:

ICSD 30319

PDF 28-176

Laitakarite Image

Images:

Laitakarite

Comments: Polished section (PPL) image of fine grains of laitakarite (bladed-lait)) disseminated through massive chalcopyrite (cp) and pyrrhotite (po) at the top of the chalcopyrite stringer zone.
Location: Giant Kidd Creek Volcanogenic Massive Sulfide deposit, Western Abitibi Subprovince, Timmins, Ontario, Canada. Scale: F.V. = 0.5 mm.
© National Resouces of Canada

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),

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

Stasova M M , Izvestiya Akademii Nauk SSSR , 4 (1968) p.28-31, The crystal structure of bismuthum selenide Bi4Se3

Physical Properties of Laitakarite

Cleavage:

{???} Perfect

Color:

Lead gray, Lead white.

Density:

8.12

Diaphaneity:

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:

Bulk Density (Electron Density)=6.78 gm/cc
note: Specific Gravity of Laitakarite =8.37 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

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

Radioactivity:

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

Laitakarite Classification

Dana Class:

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

02.D - Metal Sulfides, M:S = 3:4 and 2:3

02.DC -Variable M:S

02.DC.05d Laitakarite Bi4(Se,S)3 R 3m 3 2/m

02.DC.05d Ikunolite Bi4(S,Se)3 R 3m 3 2/m

02.DC.05d Joseite Bi4(S,Te)3 R 3m 3 2/m

02.DC.05d Joseite-B Bi4(S,Te)3 R 3m 3 2/m

02.DC.05d 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 - 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
15 - WWW-MINCRYST

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

Laitakarite

Bi4(Se,S)3
Dana No: 02.06.02.04 Strunz No: 02.DC.05d
Locality:

Notes: