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Larosite Mineral Data
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General Larosite Information
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 Chemical Formula: |
(Cu,Ag)21(Pb,Bi)2S13 |
| Composition: |
Molecular Weight = 2,256.15 gm |
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Copper 53.51 % Cu |
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Silver 9.56 % Ag |
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Bismuth 9.26 % Bi |
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Lead 9.18 % Pb |
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Sulfur 18.48 % S |
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______ |
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100.00 % |
| Empirical Formula: |
Cu19Ag2PbBiS13 |
| Environment: |
Central portion of a vein with chalcocite and stromeyerite. |
| IMA Status: |
Approved IMA 1972 |
| Locality: |
Foster mine, Cobalt, Ontario, Canada. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Fred LaRose, a discoverer of silver ore at Cobalt. |
| Name Pronunciation: |
Larosite  |
| Synonym: |
IMA1971-014 |
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Larosite Crystallography
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| Axial Ratios: |
a:b:c =0.9217:1:0.4856 |
| Cell Dimensions: |
a = 22.15, b = 24.03, c = 11.67, Z = 10; V = 6,211.53 Den(Calc)= 6.03 |
| Crystal System: |
Orthorhombic Space Group: Unk |
| X Ray Diffraction: |
By Intensity(I/Io): 1.982(1), 2.917(0.9), 2.846(0.6), |
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Physical Properties of Larosite
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| Color: |
Black. |
| Diaphaneity: |
Opaque |
| Habit: |
Acicular - Occurs as needle-like crystals. |
| Habit: |
Microscopic Crystals - Crystals visible only with microscopes. |
| Hardness: |
3-3.5 - Calcite-Copper Penny |
| Luster: |
Metallic |
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Optical Properties of Larosite
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| RL Anisotrophism: |
Moderate, in gray and greenish buff. |
| RL Color: |
Whitish buff. |
| RL Pleochroism: |
Weak. |
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Calculated Properties of Larosite
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| Electron Density: |
Bulk Density (Electron Density)=5.44 gm/cc
note: Specific Gravity of Larosite =6.03 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PELarosite = 371.54 barns/electron
U=PELarosite x rElectron Density=2,021.76 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Larosite is Not Radioactive |
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Larosite Classification
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| Dana Class: |
02.16.09.01 (02)Sulfides - Including Selenides and Tellurides |
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(02.16)with miscellaneous formulae |
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(02.16.09)Dana Group |
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02.16.09.01 Larosite (Cu,Ag)21(Pb,Bi)2S13 Unk Ortho |
| Strunz Class: |
02.LB.35 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.L - Unclassified Sulfosalts |
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02.LB -With essential Pb |
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02.LB.35 Larosite (Cu,Ag)21(Pb,Bi)2S13 Unk Ortho |
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Other Larosite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Larosite :
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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Print or Cut-and-Paste your Larosite Specimen Label here :
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Larosite
(Cu,Ag)21(Pb,Bi)2S13
Dana No: 02.16.09.01 Strunz No: 02.LB.35
Locality:
Notes:
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