Ruthenarsenite Mineral Data

General Ruthenarsenite Information

Chemical Formula:

(Ru,Ni)As

Composition:

Molecular Weight = 165.40 gm

Nickel 8.87 % Ni

Arsenic 45.30 % As

Ruthenium 45.83 % Ru

______

100.00 %

Empirical Formula:

Ru_0.75Ni_0.25As

Environment:

As inclusions in Os-Ir-Ru alloys and Alpine-type ultramafics.

IMA Status:

Approved IMA 1974

Locality:

Papua New Guinea. Link to MinDat.org Location Data.

Name Origin:

Named for the composition.

Name Pronunciation:

Ruthenarsenite + Pronunciation

Synonym:

ICSD 42577

PDF 26-947

Ruthenarsenite Image

Images:

Click Here for Larger Ruthenarsenite Image

Ruthenarsenite Irarsite

Comments: Photomicrograph of the largest inclusion of ruthenarsenite (Ru) associated with irarsite inclusions (Ir) in a rutheniridosmine matrix. (CanMin, v12:280).
Location: Papua New Guinea. Scale: See Image.
© Canadian Mineralogist

Ruthenarsenite Crystallography

Axial Ratios:

a:b:c =1.7375:1:1.9092

Cell Dimensions:

a = 5.628, b = 3.239, c = 6.184, Z = 4; V = 112.73 Den(Calc)= 9.74

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 2.061(1), 2.696(0.7), 2.124(0.5),

Physical Properties of Ruthenarsenite

Color:

Brown, Brownish gray, Reddish gray.

Density:

Diaphaneity:

Opaque

Habit:

Inclusions - Generally found as inclusions in other minerals.

Hardness:

6-6.5 - Orthoclase-Pyrite

Luster:

Metallic

Optical Properties of Ruthenarsenite

RL Anisotrophism:

Strong, orange-brown to light steel gray.

RL Color:

Pale orange-brown to brownish gray.

RL Pleochroism:

Distinct.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Ruthenarsenite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	46.10	48.80
546 nm	47.50	49.50
589 nm	49.30	50.90
650 nm	51.10	52.40

**Calculated Relative Intensity Colors of Ruthenarsenite in Air**
Relative Intensity	0%	20%	40%	60%	80%	100%	120%	140%	160%	180%	190%
R₁
R₂

Calculated Properties of Ruthenarsenite

Electron Density:

Bulk Density (Electron Density)=8.60 gm/cc
note: Specific Gravity of Ruthenarsenite =9.74 gm/cc.

Fermion Index:

Fermion Index = 0.13
Boson Index = 0.87

Photoelectric:

PE_{Ruthenarsenite}= 130.21 barns/electron
U=PE_{Ruthenarsenite} x rElectron Density=1,119.54 barns/cc.

Radioactivity:

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

Ruthenarsenite Classification

Dana Class:

02.08.17.01 (02)Sulfides - Including Selenides and Tellurides

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

(02.08.17)Dana Group

02.08.17.01 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

02.08.17.02 Cherepanovite RhAs P nma 2/m 2/m 2/m

Strunz Class:

02.CC.15 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.C - Metal Sulfides, M:S = 1:1 (and similar)

02.CC -With Ni, Fe, Co, PGE, etc.

02.CC.15 Cherepanovite RhAs P nma 2/m 2/m 2/m

02.CC.15 Modderite (Co,Fe)As Pmcn 2/m 2/m 2/m

02.CC.15 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

02.CC.15 Westerveldite (Fe,Ni,Co)As Pnam 2/m 2/m 2/m

Other Ruthenarsenite Information

References:

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

See Also:

Links to other databases for Ruthenarsenite :
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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Ask about Ruthenarsenite here :
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Print or Cut-and-Paste your Ruthenarsenite Specimen Label here :

Ruthenarsenite

(Ru,Ni)As
Dana No: 02.08.17.01 Strunz No: 02.CC.15
Locality:

Notes: