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Laitakarite Mineral Data
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General Laitakarite Information
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 Chemical Formula: |
Bi4(Se,S)3 |
| Composition: |
Molecular Weight = 1,037.63 gm |
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Bismuth 80.56 % Bi |
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Selenium 17.12 % Se |
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Sulfur 2.32 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Bi4Se2.25S0.75 |
| Environment: |
In veinlets in quartz-anthophyllite-codierite-biotite rocks. |
| IMA Status: |
Approved IMA 1959 |
| Locality: |
Orij�rvi mine, Orij�rvi, 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 |
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PDF 28-176 |
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Laitakarite Image |
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Images:
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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 |
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Laitakarite Crystallography
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| 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 Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.246(1), 3.072(1), 2.112(0.8), |
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Physical Properties of Laitakarite
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| Cleavage: |
{???} Perfect |
| Color: |
Lead gray, Lead white. |
| Density: |
8.12 |
| Diaphaneity: |
Opaque |
| Fracture: |
Flexible - Flexible fragments. |
| Hardness: |
2 - Gypsum |
| Luster: |
Metallic |
| Streak: |
grayish black |
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Optical Properties of Laitakarite
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| RL Anisotrophism: |
Moderate, dark brownish gray. |
| RL Color: |
Galena white. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Laitakarite in Air
| λ |
R1 |
R2 |
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∑ R1(λ) |
∑ R2(λ) |
| 400 nm |
46.70 |
53.60 |
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| 420 nm |
46.60 |
53.80 |
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| 440 nm |
46.50 |
54.00 |
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| 460 nm |
46.20 |
54.10 |
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| 480 nm |
46.00 |
53.90 |
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| 500 nm |
45.70 |
53.40 |
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| 520 nm |
45.40 |
53.10 |
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| 540 nm |
45.00 |
53.00 |
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| 560 nm |
44.70 |
53.00 |
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| 580 nm |
44.30 |
52.80 |
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| 600 nm |
44.00 |
52.50 |
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| 620 nm |
43.70 |
52.00 |
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| 640 nm |
43.30 |
51.70 |
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| 660 nm |
43.00 |
51.10 |
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| 680 nm |
42.50 |
50.60 |
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| 700 nm |
42.10 |
50.00 |
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Calculated Relative Intensity Colors of Laitakarite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
200% |
| R1 |
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| R2 |
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Calculated Properties of Laitakarite
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| Electron Density: |
Bulk Density (Electron Density)=6.78 gm/cc
note: Specific Gravity of Laitakarite =8.37 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PELaitakarite =1,614.52 barns/electron
U=PELaitakarite x rElectron Density=10952.70 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Laitakarite is Not Radioactive |
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Laitakarite Classification
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| Dana Class: |
02.06.02.04 (02)Sulfides - Including Selenides and Tellurides |
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(02.06)where Am Bn Xp, with (m+n):p=4:3 |
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(02.06.02)Joseite Group (Trigonal: R-3m) |
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02.06.02.01 Joseite Bi4(S,Te)3 R 3m 3 2/m |
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02.06.02.02 Joseite-B Bi4(S,Te)3 R 3m 3 2/m |
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02.06.02.03 Ikunolite Bi4(S,Se)3 R 3m 3 2/m |
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02.06.02.04 Laitakarite Bi4(Se,S)3 R 3m 3 2/m |
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02.06.02.05 Pilsenite Bi4Te3 R 3m 3 2/m |
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02.06.02.06 Poubaite PbBi2Se2(Te,S)2 R 3m 3 2/m |
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02.06.02.07 Rucklidgeite (Bi,Pb)3Te4 R 3m 3 2/m |
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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 |
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02.D - Metal Sulfides, M:S = 3:4 and 2:3 |
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02.DC -Variable M:S |
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02.DC.05d Laitakarite Bi4(Se,S)3 R 3m 3 2/m |
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02.DC.05d Ikunolite Bi4(S,Se)3 R 3m 3 2/m |
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02.DC.05d Joseite Bi4(S,Te)3 R 3m 3 2/m |
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02.DC.05d Joseite-B Bi4(S,Te)3 R 3m 3 2/m |
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02.DC.05d Pilsenite Bi4Te3 R 3m 3 2/m |
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Other Laitakarite Information
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| 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 :
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Laitakarite
Bi4(Se,S)3
Dana No: 02.06.02.04 Strunz No: 02.DC.05d
Locality:
Notes:
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