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Iridarsenite Mineral Data
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General Iridarsenite Information
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 Chemical Formula: |
(Ir,Ru)As2 |
| Composition: |
Molecular Weight = 319.28 gm |
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Arsenic 46.93 % As |
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Iridium 45.15 % Ir |
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Ruthenium 7.91 % Ru |
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______ |
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100.00 % |
| Empirical Formula: |
Ir0.75Ru0.25As2 |
| 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 |
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PDF 14-411 |
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Iridarsenite Crystallography
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| 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 - Prismatic H-M Symbol (2/m) Space Group: P 21/c |
| X Ray Diffraction: |
By Intensity(I/Io): 3.9(1), 2.84(0.7), 2.069(0.6), |
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Physical Properties of Iridarsenite
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| Color: |
Gray. |
| Density: |
10.9 |
| Diaphaneity: |
Opaque |
| Hardness: |
5-5.5 - Apatite-Knife Blade |
| Luster: |
Metallic |
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Optical Properties of Iridarsenite
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| 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 |
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∑ R1(λ) |
∑ R2(λ) |
| 470 nm |
47.20 |
46.90 |
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| 546 nm |
45.40 |
46.10 |
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| 589 nm |
44.90 |
46.60 |
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| 650 nm |
41.40 |
44.00 |
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Calculated Relative Intensity Colors of Iridarsenite in Air
Relative
Intensity |
0% |
30% |
60% |
90% |
100% |
120% |
150% |
180% |
210% |
| R1 |
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| R2 |
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Calculated Properties of Iridarsenite
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| Electron Density: |
Bulk Density (Electron Density)=8.60 gm/cc
note: Specific Gravity of Iridarsenite =10.2 gm/cc.
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| Fermion Index: |
Fermion Index = 0.02
Boson Index = 0.98 |
| Photoelectric: |
PEIridarsenite = 715.42 barns/electron
U=PEIridarsenite x rElectron Density=6,153.54 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Iridarsenite is Not Radioactive |
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Iridarsenite Classification
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| Dana Class: |
02.12.04.05 (02)Sulfides - Including Selenides and Tellurides |
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(02.12)where Am Bn Xp, with (m+n):p=1:2 |
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(02.12.04)Arsenopyrite Group (Monoclinic: P21/c (Pseudo-orthorhombic)) |
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02.12.04.01 Arsenopyrite FeAsS P 21/c 2/m |
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02.12.04.02 Gudmundite FeSbS P 21/n 2/m |
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02.12.04.03 Osarsite (Os,Ru)AsS P 21/c 2/m |
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02.12.04.04 Ruarsite RuAsS P 21/c 2/m |
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02.12.04.05 Iridarsenite (Ir,Ru)As2 P 21/c 2/m |
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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 |
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02.A - Simple Sulfides, Selenides, etc |
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02.AC -Alloys of metalloids with PGE |
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02.AC.45b Iridarsenite (Ir,Ru)As2 P 21/c 2/m |
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Other Iridarsenite Information
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| 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 :
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Iridarsenite
(Ir,Ru)As2
Dana No: 02.12.04.05 Strunz No: 02.AC.45b
Locality:
Notes:
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