Omeiite Mineral Data

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.

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

Diaphaniety:

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:

r_electron=8.23 gm/cc
note: r_Omeiite=9.76 gm/cc.

Fermion Index

Fermion Index = 0.10315
Boson Index = 0.89685

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Omeiite is Not Radioactive

Omeiite Classification

Dana Class:

2.12.2.7 (2)Sulfides - Including Selenides and Tellurides

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

(2.12.2)Marcasite Group (Orthorhombic: Pnnm)

2.12.2.1 Marcasite FeS2 Pnnm 2/m 2/m 2/m

2.12.2.2 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

2.12.2.3 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

2.12.2.4 Hastite CoSe2 Pnnm 2/m 2/m 2/m

2.12.2.5 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

2.12.2.6 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.9 Lollingite FeAs2 Pnnm 2/m 2/m 2/m

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

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

2.12.2.12 Rammelsbergite NiAs2 Pnnm 2/m 2/m 2/m

2.12.2.13 Nisbite NiSb2 Pnnm 2/m 2/m 2/m

Strunz Class:

II/D.20-80 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.20 - Markasite - Iridarsenite series

II/D.20-10 Marcasite FeS2 Pnnm 2/m 2/m 2/m

II/D.20-20 Ferroselite FeSe2 Pnnm 2/m 2/m 2/m

II/D.20-30 Hastite CoSe2 Pnnm 2/m 2/m 2/m

II/D.20-40 Kullerudite NiSe2 Pnnm 2/m 2/m 2/m

II/D.20-50 Frohbergite FeTe2 Pnnm 2/m 2/m 2/m

II/D.20-60 Mattagamite CoTe2 Pnnm 2/m 2/m 2/m

II/D.20-70 Anduoite (Ru,Os)As2 Pnnm 2/m 2/m 2/m

II/D.20-80 Omeiite (Os,Ru)As2 Pnnm 2/m 2/m 2/m

II/D.20-90 Iridarsenite (Ir,Ru)As2 P 2₁/c 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 -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 - WWW-MINCRYST 13 -École des Mines de Paris

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Omeiite

(Os,Ru)As2
Dana No: 2.12.2.7 Strunz No: II/D.20-80
Locality:

Notes: