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Omeiite Mineral Data
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General Omeiite Information
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 Chemical Formula: |
(Os,Ru)As2 |
| Composition: |
Molecular Weight = 317.76 gm |
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Arsenic 47.16 % As |
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Osmium 44.89 % Os |
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Ruthenium 7.95 % Ru |
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______ |
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100.00 % |
| Empirical Formula: |
Os0.75Ru0.25As2 |
| Environment: |
Found in a Cu-Ni sulfide deposit associated with an ultramafic body. |
| IMA Status: |
Approved IMA 1978 |
| Locality: |
Danba, Omeishan Mt, Sichuan (Szechuan), China, Link to MinDat.org Location Data. |
| Name Origin: |
Named for the locality. |
| Name Pronunciation: |
Omeiite  |
| Synonym: |
ICSD 995 |
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PDF 34-336 |
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Omeiite Crystallography
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| Axial Ratios: |
a:b:c =0.8174:1:0.4565 |
| Cell Dimensions: |
a = 5.409, b = 6.617, c = 3.021, Z = 2; V = 108.13 Den(Calc)= 9.76 |
| Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnnm |
| X Ray Diffraction: |
By Intensity(I/Io): 1.915(1), 2.63(1), 2.67(0.8), |
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Physical Properties of Omeiite
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| Cleavage: |
{???} Good |
| Color: |
Steel gray. |
| Density: |
11.2 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Hardness: |
7 - Quartz |
| Luster: |
Metallic |
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Optical Properties of Omeiite
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| RL Anisotrophism: |
Distinct. |
| RL Color: |
White with a yellow tint in air, milky yellow in oil. |
| RL Pleochroism: |
Weak, yellow to grayish yellow.. |
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Calculated Properties of Omeiite
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| Electron Density: |
Bulk Density (Electron Density)=8.23 gm/cc
note: Specific Gravity of Omeiite =9.76 gm/cc.
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| Fermion Index: |
Fermion Index = 0.1
Boson Index = 0.9 |
| Photoelectric: |
PEOmeiite = 680.53 barns/electron
U=PEOmeiite x rElectron Density=5,601.83 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Omeiite is Not Radioactive |
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Omeiite Classification
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| Dana Class: |
02.12.02.07 (02)Sulfides - Including Selenides and Tellurides |
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(02.12)where Am Bn Xp, with (m+n):p=1:2 |
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(02.12.02)Marcasite Group (Orthorhombic: Pnnm) |
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02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m |
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02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m |
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02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m |
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02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m |
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02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m |
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02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m |
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02.12.02.07 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m |
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02.12.02.08 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m |
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02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m |
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02.12.02.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m |
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02.12.02.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m |
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02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m |
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02.12.02.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m |
| Strunz Class: |
02.EB.15a 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf |
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02.E - Metal Sulfides, M:S � 1:2 |
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02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc. |
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02.EB.15a Clinosafflorite (Co,Fe,Ni)As2 P 21/n 2/m |
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02.EB.15a Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m |
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02.EB.15a Lollingite FeAs2 Pnnm 2/m 2/m 2/m |
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02.EB.15a Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m |
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02.EB.15a Nisbite NiSb2 Pnnm 2/m 2/m 2/m |
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02.EB.15a Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m |
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02.EB.15a Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m |
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Other Omeiite 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 Omeiite :
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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Omeiite
(Os,Ru)As2
Dana No: 02.12.02.07 Strunz No: 02.EB.15a
Locality:
Notes:
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