Ruthenarsenite Mineral Data

Ruthenarsenite Mineral Data +

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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.

Synonym:

ICSD 42577

PDF 26-947

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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:

Diaphaniety:

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:

r_electron=8.60 gm/cc
note: r_{Ruthenarsenite}=9.74 gm/cc.

Fermion Index

Fermion Index = 0.13757
Boson Index = 0.86243

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ruthenarsenite is Not Radioactive

Ruthenarsenite Classification

Dana Class:

2.8.17.1 (2)Sulfides - Including Selenides and Tellurides

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

(2.8.17)Dana Group

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

2.8.17.2 Cherepanovite RhAs P nma 2/m 2/m 2/m

Strunz Class:

II/C.20-120 II - Sulfides and sulphosalts

II/C - Sulfides with metal: sulfur, selenium and tellurium = 1:1

II/C.20 - Nickeline group and related compounds, Polarite - Cherepanovite series

II/C.20-05 Sorosite! Cu(Sn,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-10 Langisite (Co,Ni)As P 6₃/mmc 6/m 2/m 2/m

II/C.20-20 Nickeline NiAs P 6₃/mmc 6/m 2/m 2/m

II/C.20-30 Breithauptite NiSb P 6₃/mmc 6/m 2/m 2/m

II/C.20-40 Freboldite CoSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-50 Sederholmite NiSe P 6₃/mmc 6/m 2/m 2/m

II/C.20-70 Hexatestibiopanickelite (Ni,Pd)(Te,Sb) P 6₃/mmc 6/m 2/m 2/m

II/C.20-75 Yuanjiangite AuSn P 6₃/mmc 6/m 2/m 2/m

II/C.20-80 Kotulskite Pd(Te,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-90 Sudburyite (Pd,Ni)Sb P 6₃/mmc 6/m 2/m 2/m

II/C.20-95 Stumpflite Pt(Sb,Bi) P 6₃/mmc 6/m 2/m 2/m

II/C.20-100 Polarite Pd(Bi,Pb) Ccm21 mm2

II/C.20-110 Sobolevskite PdBi P 6₃/mmc 6/m 2/m 2/m

II/C.20-120 Ruthenarsenite (Ru,Ni)As P nma 2/m 2/m 2/m

II/C.20-130 Cherepanovite RhAs P nma 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 -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 -École des Mines de Paris

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Ruthenarsenite

(Ru,Ni)As
Dana No: 2.8.17.1 Strunz No: II/C.20-120
Locality:

Notes: