Laitakarite Mineral Data (original) (raw)
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:
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
PDF 28-176
Laitakarite Image
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
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
X Ray Diffraction:
By Intensity(I/Io): 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
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| | 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 | R 2 |  |
∑ 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 |  |
Calculated Relative Intensity Colors of Laitakarite in Air
| RelativeIntensity | 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:
PELaitakarite =1,614.52 barns/electron
U=PELaitakarite 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: