Iridarsenite Mineral Data

Iridarsenite Mineral Data +

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General Iridarsenite Information

Chemical Formula:

(Ir,Ru)As2

Composition:

Molecular Weight = 319.28 gm

Arsenic 46.93 % As

Iridium 45.15 % Ir

Ruthenium 7.91 % Ru

______

100.00 %

Empirical Formula:

Ir_0.75Ru_0.25As₂

Environment:

In nuggets or fragments of natural Os-Ir-Ru alloys.

IMA Status:

Approved IMA 1974

Locality:

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

Name Origin:

For the IRIDium and ARSENic in the composition.

Synonym:

ICSD 42573

PDF 14-411

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Iridarsenite Crystallography

Axial Ratios:

a:b:c =0.9983:1:1.0198

Cell Dimensions:

a = 6.05, b = 6.06, c = 6.18, Z = 4; beta = 113.283° V = 208.13 Den(Calc)= 10.19

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): 3.9(1), 2.84(0.7), 2.069(0.6),

Crystal Structure:

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Kjekshus A , Acta Chemica Scandinavica , 25 (1971) p.411-422, On the properties of binary compounds, with the CoSb2 type crystal structure, Locality: synthetic

Physical Properties of Iridarsenite

Color:

Gray.

Density:

10.9

Diaphaniety:

Opaque

Hardness:

5-5.5 - Apatite-Knife Blade

Luster:

Metallic

Optical Properties of Iridarsenite

RL Anisotrophism:

Weak but distinct, from medium gray to pale orange brown.

RL Color:

Medium gray with brownish tint.

RL Pleochroism:

Weak to none.

Reflectivity

**Standardized Intensity (100%) Reflection Spectra of Iridarsenite in Air**
λ	R₁	R₂	∑ R₁(λ)	∑ R₂(λ)
470 nm	47.20	46.90
546 nm	45.40	46.10
589 nm	44.90	46.60
650 nm	41.40	44.00

**Calculated Relative Intensity Colors of Iridarsenite in Air**
Relative Intensity	0%	30%	60%	90%	100%	120%	150%	180%	210%
R₁
R₂

Calculated Properties of Iridarsenite

Electron Density:

r_electron=8.60 gm/cc
note: r_Iridarsenite=10.2 gm/cc.

Fermion Index

Fermion Index = 0.02358
Boson Index = 0.97642

Photoelectric:

PE_Iridarsenite= 715.42 barns/electron
U=PE_Iridarsenite x r_electron=6,153.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Iridarsenite is Not Radioactive

Iridarsenite Classification

Dana Class:

2.12.4.5 (2)Sulfides - Including Selenides and Tellurides

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

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

2.12.4.1 Arsenopyrite FeAsS P 2₁/c 2/m

2.12.4.2 Gudmundite FeSbS P 2₁/n 2/m

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

2.12.4.4 Ruarsite RuAsS P 2₁/c 2/m

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

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

Strunz Class:

II/D.20-90 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 Iridarsenite Information

References:

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

See Also:

Links to other databases for Iridarsenite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 -École des Mines de Paris

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Iridarsenite

(Ir,Ru)As2
Dana No: 2.12.4.5 Strunz No: II/D.20-90
Locality:

Notes: