Mineralogy Database

Iridarsenite Mineral Data

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General Iridarsenite Information

Help on Chemical  Formula: Chemical Formula: (Ir,Ru)As2
Help on Composition: Composition: Molecular Weight = 319.28 gm
   Arsenic    46.93 %  As
   Iridium    45.15 %  Ir
   Ruthenium   7.91 %  Ru
             100.00 % 
Help on Empirical Formula: Empirical Formula: Ir0.75Ru0.25As2
Help on Environment: Environment: In nuggets or fragments of natural Os-Ir-Ru alloys.
Help on IMA Status: IMA Status: Approved IMA 1974
Help on Locality: Locality: From Papua New Guinea. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For the IRIDium and ARSENic in the composition.
Help on Name Pronunciation: Name Pronunciation: Iridarsenite + Pronunciation Say IRIDARSENITE
Help on Synonym: Synonym: ICSD 42573
  PDF 14-411

Iridarsenite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9983:1:1.0198
Help on Cell Dimensions: Cell Dimensions: a = 6.05, b = 6.06, c = 6.18, Z = 4; beta = 113.283° V = 208.13 Den(Calc)= 10.19
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.9(1), 2.84(0.7), 2.069(0.6),

Physical Properties of Iridarsenite

Help on Color: Color: Gray.
Help on Density: Density: 10.9
Help on Diaphaneity: Diaphaneity: Opaque
Help on Hardness: Hardness: 5-5.5 - Apatite-Knife Blade
Help on Luster: Luster: Metallic

Optical Properties of Iridarsenite

Help on RL Anisotrophism: RL Anisotrophism: Weak but distinct, from medium gray to pale orange brown.
Help on RL Color: RL Color: Medium gray with brownish tint.
Help on RL Pleochroism: RL Pleochroism: Weak to none.
Help on Reflectivity 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
   0%   30%   60%   90% 100% 120% 150% 180% 210%

Calculated Properties of Iridarsenite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=8.60 gm/cc
note: Specific Gravity of Iridarsenite =10.2 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PEIridarsenite = 715.42 barns/electron
U=PEIridarsenite x rElectron Density=6,153.54 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Iridarsenite is Not Radioactive

Iridarsenite Classification

Help on  Dana Class: Dana Class: (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)) Arsenopyrite FeAsS P 21/c 2/m Gudmundite FeSbS P 21/n 2/m Osarsite (Os,Ru)AsS P 21/c 2/m Ruarsite RuAsS P 21/c 2/m Iridarsenite (Ir,Ru)As2 P 21/c 2/m Clinosafflorite (Co,Fe,Ni)As2 P 21/n 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
Help on See Also: 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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Dana No: Strunz No: 02.AC.45b





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