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.

Name Pronunciation:

Iridarsenite + Pronunciation

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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drag2 - RMB Resize/Rotate
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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

Diaphaneity:

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:

Bulk Density (Electron Density)=8.60 gm/cc
note: Specific Gravity of Iridarsenite =10.2 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

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

Radioactivity:

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

Iridarsenite Classification

Dana Class:

02.12.04.05 (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.AC.45b 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf

02.A - Simple Sulfides, Selenides, etc

02.AC -Alloys of metalloids with PGE

02.AC.45b 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 - 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 Iridarsenite Specimen Label here :

Iridarsenite

(Ir,Ru)As2
Dana No: 02.12.04.05 Strunz No: 02.AC.45b
Locality:

Notes: