Larosite Mineral Data + 
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- 2.16.9.1 Larosite (Cu,Ag)21(Pb,Bi)2S13 Unk Ortho
- II/E.02-10 Larosite (Cu,Ag)21(Pb,Bi)2S13 Unk Ortho
General Larosite Information |
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 Chemical Formula: |
(Cu,Ag)21(Pb,Bi)2S13 | ||
| Composition: |
Molecular Weight = 2,256.15 gm | ||
| Copper 53.51 % Cu | |||
| Silver 9.56 % Ag | |||
| Bismuth 9.26 % Bi | |||
| Lead 9.18 % Pb | |||
| Sulfur 18.48 % S | |||
| ______ | |||
| 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. | ||
| Synonym: |
IMA1971-014 | ||
Search for Larosite Images | |||
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Images:
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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: |
OrthorhombicSpace Group: Unk | ||
| X Ray Diffraction: |
By Intensity(I/Io): 1.982(1), 2.917(0.9), 2.846(0.6), | ||
Physical Properties of Larosite |
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| Color: |
Black. | ||
| Diaphaniety: |
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 | ||
Optical Properties of Larosite |
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| RL Anisotrophism: |
Moderate, in gray and greenish buff. | ||
| RL Color: |
Whitish buff. | ||
| RL Pleochroism: |
Weak. | ||
Calculated Properties of Larosite |
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| Electron Density: |
relectron=5.44 gm/cc |
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| Fermion Index |
Fermion Index = 0.02168 Boson Index = 0.97832 |
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| Photoelectric: |
PELarosite = 371.54 barns/electron |
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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: |
2.16.9.1 (2)Sulfides - Including Selenides and Tellurides | ||
| (2.16)with miscellaneous formulae | |||
| (2.16.9)Dana Group | |||
| Strunz Class: |
II/E.02-10 II - Sulfides and sulphosalts | ||
| II/E - Sulfosalts (S : As,Sb,Bi = x), Sulfosalts with predominant Iron and Copper x = 2.0 | |||
| II/E.02 - Larosite series | |||
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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris Search for Larosite using: Visit our Advertisers for Larosite : Translate Larosite Mineral Data : Ask about Larosite here : Print or Cut-and-Paste your Larosite Specimen Label here :
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