Omeiite Mineral Data

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General Omeiite Information

Chemical Formula:

(Os,Ru)As2

Composition:

Molecular Weight = 317.76 gm

Arsenic 47.16 % As

Osmium 44.89 % Os

Ruthenium 7.95 % Ru

______

100.00 %

Empirical Formula:

Os_0.75Ru_0.25As₂

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

PDF 34-336

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Omeiite Crystallography

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 - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pnnm

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 1.915(1), 2.63(1), 2.67(0.8),

Crystal Structure:

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OsAs2 , Kjekshus A , Rakke T , Andresen A F , Acta Chemica Scandinavica A , 31 (1977) p.253-259, Compounds with the marcasite type crystal structure. XII. Structural data for, RuP2, RuAs2, RuSb2, OsP2, OsAs2, and OsSb2, Locality: synthetic

Physical Properties of Omeiite

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

Optical Properties of Omeiite

RL Anisotrophism:

Distinct.

RL Color:

White with a yellow tint in air, milky yellow in oil.

RL Pleochroism:

Weak, yellow to grayish yellow..

Calculated Properties of Omeiite

Electron Density:

Bulk Density (Electron Density)=8.23 gm/cc
note: Specific Gravity of Omeiite =9.76 gm/cc.

Fermion Index:

Fermion Index = 0.1
Boson Index = 0.9

Photoelectric:

PE_Omeiite= 680.53 barns/electron
U=PE_Omeiite x rElectron Density=5,601.83 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Omeiite is Not Radioactive

Omeiite Classification

Dana Class:

02.12.02.07 (02)Sulfides - Including Selenides and Tellurides

(02.12)where Am Bn Xp, with (m+n):p=1:2

(02.12.02)Marcasite Group (Orthorhombic: Pnnm)

02.12.02.01 Marcasite FeS2 Pnnm 2/m 2/m 2/m

02.12.02.02 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

02.12.02.03 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

02.12.02.04 Hastite? CoSe2 Pnnm 2/m 2/m 2/m

02.12.02.05 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

02.12.02.06 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

02.12.02.07 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

02.12.02.08 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

02.12.02.09 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

02.12.02.10 Seinajokite (Fe,Ni)(Sb,As)2 Pnnm 2/m 2/m 2/m

02.12.02.11 Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

02.12.02.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

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

02.E - Metal Sulfides, M:S £ 1:2

02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.

02.EB.15a Clinosafflorite (Co,Fe,Ni)As2 P 2₁/n 2/m

02.EB.15a Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

02.EB.15a Lollingite FeAs2 Pnnm 2/m 2/m 2/m

02.EB.15a Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

02.EB.15a Nisbite NiSb2 Pnnm 2/m 2/m 2/m

02.EB.15a Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

02.EB.15a Safflorite (Co,Fe)As2 Pnnm 2/m 2/m 2/m

Other Omeiite Information

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Omeiite Specimen Label here :

Omeiite

(Os,Ru)As2
Dana No: 02.12.02.07 Strunz No: 02.EB.15a
Locality:

Notes: