Mineralogy Database

Laitakarite Mineral Data

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General Laitakarite Information

Help on Chemical  Formula: Chemical Formula: Bi4(Se,S)3
Help on Composition: Composition: Molecular Weight = 1,037.63 gm
   Bismuth   80.56 %  Bi
   Selenium  17.12 %  Se
   Sulfur     2.32 %  S
            100.00 % 
Help on Empirical Formula: Empirical Formula: Bi4Se2.25S0.75
Help on Environment: Environment: In veinlets in quartz-anthophyllite-codierite-biotite rocks.
Help on IMA Status: IMA Status: Approved IMA 1959
Help on Locality: Locality: Orij�rvi mine, Orij�rvi, Finland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Aarne Laitakari, Director, Geological Survey of Finland, who collected the original material.
Help on Name Pronunciation: Name Pronunciation: Laitakarite + Pronunciation Say LAITAKARITE
Help on Synonym: Synonym: ICSD 30319
  PDF 28-176

Laitakarite Image

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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

Help on Axial Ratios: Axial Ratios: a:c = 1:9.45088
Help on Cell Dimensions: Cell Dimensions: a = 4.225, c = 39.93, Z = 3; V = 617.28 Den(Calc)= 8.37
Help on Crystal System: Crystal System: Trigonal - Hexagonal Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.246(1), 3.072(1), 2.112(0.8),

Physical Properties of Laitakarite

Help on Cleavage: Cleavage: {???} Perfect
Help on Color: Color: Lead gray, Lead white.
Help on Density: Density: 8.12
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Hardness: Hardness: 2 - Gypsum
Help on Luster: Luster: Metallic
Help on Streak: Streak: grayish black

Optical Properties of Laitakarite

Help on RL Anisotrophism: RL Anisotrophism: Moderate, dark brownish gray.
Help on RL Color: RL Color: Galena white.
Help on Reflectivity 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
   0%   30%   60%   90% 100% 120% 150% 180% 200%

Calculated Properties of Laitakarite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=6.78 gm/cc
note: Specific Gravity of Laitakarite =8.37 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PELaitakarite =1,614.52 barns/electron
U=PELaitakarite x rElectron Density=10952.70 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laitakarite is Not Radioactive

Laitakarite Classification

Help on  Dana Class: Dana Class: (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) Joseite Bi4(S,Te)3 R 3m 3 2/m Joseite-B Bi4(S,Te)3 R 3m 3 2/m Ikunolite Bi4(S,Se)3 R 3m 3 2/m Laitakarite Bi4(Se,S)3 R 3m 3 2/m Pilsenite Bi4Te3 R 3m 3 2/m Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m Babkinite! Pb2Bi2(S,Se)3 P 3,P 3m Trig
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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

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Dana No: Strunz No: 02.DC.05d





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