Osarsite Mineral Data

General Osarsite Information

Chemical Formula:

(Os,Ru)AsS

Composition:

Molecular Weight = 274.91 gm

Arsenic 27.25 % As

Osmium 51.89 % Os

Ruthenium 9.19 % Ru

Sulfur 11.66 % S

______

100.00 %

Empirical Formula:

Os_0.75Ru_0.25AsS

Environment:

In a platinum-bearing sample of placer sand.

IMA Status:

Approved IMA 1972

Locality:

Gold Bluff, 3 to 6 miles north of Orick, Humboldt Co., California. Link to MinDat.org Location Data.

Name Origin:

Named after it's chemical composition of osmium and arsenic.

Name Pronunciation:

Osarsite

Synonym:

ICSD 42580

PDF 25-595

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Osarsite Crystallography

Axial Ratios:

a:b:c =1.0028:1:1.0157

Cell Dimensions:

a = 5.933, b = 5.916, c = 6.009, Z = 4; beta = 112.35° V = 195.07 Den(Calc)= 9.36

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 1.892(1), 3.79(1), 1.87(0.8),

Physical Properties of Osarsite

Color:

Gray.

Density:

8.44

Diaphaneity:

Opaque

Habit:

Intergrown Crystals - Occurs as intergrown crystalline aggregates

Hardness:

6 - Orthoclase

Luster:

Metallic

Optical Properties of Osarsite

RL Anisotrophism:

Weak but distinct in air.

RL Color:

Gray.

Calculated Properties of Osarsite

Electron Density:

Bulk Density (Electron Density)=7.97 gm/cc
note: Specific Gravity of Osarsite =9.36 gm/cc.

Fermion Index:

Fermion Index = 0.12
Boson Index = 0.88

Photoelectric:

PE_Osarsite= 759.50 barns/electron
U=PE_Osarsite x rElectron Density=6,051.10 barns/cc.

Radioactivity:

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

Osarsite Classification

Dana Class:

02.12.04.03 (02)Sulfides - Including Selenides and Tellurides

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

(02.12.04)Arsenopyrite Group (Monoclinic: P21/c (Pseudo-orthorhombic))

02.12.04.01 Arsenopyrite FeAsS P 2₁/c 2/m

02.12.04.02 Gudmundite FeSbS P 2₁/n 2/m

02.12.04.03 Osarsite (Os,Ru)AsS P 2₁/c 2/m

02.12.04.04 Ruarsite RuAsS P 2₁/c 2/m

02.12.04.05 Iridarsenite (Ir,Ru)As2 P 2₁/c 2/m

02.12.04.06 Clinosafflorite (Co,Fe,Ni)As2 P 2₁/n 2/m

Strunz Class:

02.EB.20 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.20 Arsenopyrite FeAsS P 2₁/c 2/m

02.EB.20 Gudmundite FeSbS P 2₁/n 2/m

02.EB.20 Ruarsite RuAsS P 2₁/c 2/m

02.EB.20 Paxite CuAs2 P 2₁/c 2/m

02.EB.20 Osarsite (Os,Ru)AsS P 2₁/c 2/m

Other Osarsite Information

References:

NAME( MinRec) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

See Also:

Links to other databases for Osarsite :
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 Osarsite Specimen Label here :

Osarsite

(Os,Ru)AsS
Dana No: 02.12.04.03 Strunz No: 02.EB.20
Locality:

Notes: