Irarsite Mineral Data (original) (raw)
General Irarsite Information
Chemical Formula:
(Ir,Ru,Rh,Pt)AsS
Composition:
Molecular Weight = 254.29 gm
Arsenic 29.46 % As
Iridium 30.24 % Ir
Ruthenium 11.92 % Ru
Platinum 7.67 % Pt
Rhodium 8.09 % Rh
Sulfur 12.61 % S
______
100.00 %
Empirical Formula:
Ir0.4Ru0.3Rh0.2Pt0.1AsS
Environment:
Grains in chromite in hortonolite dunite. Intergrown with hollingworthite or laurite.
IMA Status:
Approved IMA 1966
Locality:
Ub tge Onverwacht and Driekop mines, Transvaal, South Africa. Link to MinDat.org Location Data.
Name Origin:
For the Iridium and ARSenic in the composition.
Name Pronunciation:
Irarsite 
Irarsite Image
Images:
 |
Irarsite Ruthenarsenite Comments: Photomicrograph of the largest inclusion of ruthenarsenite (Ru) associated with irarsite inclusions (Ir) in a rutheniridosmine matrix. (CanMin, v12:280). Location: Papua New Guinea.Scale: See Image. © Canadian Mineralogist |
|---|
Irarsite Crystallography
Cell Dimensions:
a = 5.777, Z = 5; V = 192.80 Den(Calc)= 10.95
Crystal System:
Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3
X Ray Diffraction:
By Intensity(I/Io): 1.74(1), 2.87(1), 3.32(1),
Physical Properties of Irarsite
Color:
Iron black.
Diaphaneity:
Opaque
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Hardness:
6.5 - Pyrite
Luster:
Metallic
Optical Properties of Irarsite
RL Color:
White, grayish with blue tint.
Reflectivity
Standardized Intensity (100%) Reflection Spectra of Irarsite in Air
| λ | R |  |
∑ R(λ) |
|---|---|---|---|
| 420 nm | 44.00 |  |
|
| 440 nm | 43.70 |  |
|
| 460 nm | 43.30 |  |
|
| 480 nm | 42.60 |  |
|
| 500 nm | 42.10 |  |
|
| 520 nm | 41.20 |  |
|
| 540 nm | 40.60 |  |
|
| 560 nm | 39.70 |  |
|
| 580 nm | 39.10 |  |
|
| 600 nm | 38.60 |  |
|
| 620 nm | 38.10 |  |
|
| 640 nm | 37.80 |  |
|
| 660 nm | 37.20 |  |
|
| 680 nm | 36.80 |  |
|
| 700 nm | 36.60 |  |
Calculated Relative Intensity Colors of Irarsite in Air
| RelativeIntensity | 0% | 30% | 60% | 90% | 100% | 120% | 150% | 180% | 210% | 230% |
|---|---|---|---|---|---|---|---|---|---|---|
| R |
Calculated Properties of Irarsite
Electron Density:
Bulk Density (Electron Density)=9.46 gm/cc
note: Specific Gravity of Irarsite =11.0 gm/cc.
Fermion Index:
Fermion Index = 0.06
Boson Index = 0.94
Photoelectric:
PEIrarsite = 614.75 barns/electron
U=PEIrarsite x rElectron Density=5,813.33 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Irarsite is Not Radioactive
Irarsite Classification
Dana Class:
02.12.03.07 (02)Sulfides - Including Selenides and Tellurides
(02.12)where Am Bn Xp, with (m+n):p=1:2
(02.12.03)Cobaltite Group (Cubic or pseudocubic crystals)
02.12.03.01 Cobaltite CoAsS P ca21 mm2
02.12.03.02 Gersdorffite NiAsS P 213 2 3
02.12.03.03 Ullmannite NiSbS P 213 2 3
02.12.03.04 Willyamite (Co,Ni)SbS P 213 2 3
02.12.03.05 Tolovkite IrSbS P 213 2 3
02.12.03.06 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3
02.12.03.07 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3
02.12.03.08 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3
02.12.03.09 Jolliffeite (Ni,Co)AsSe P a3 2/m 3
02.12.03.10 Padmaite PdBiSe P 213 2 3
02.12.03.11 Michenerite (Pd,Pt)BiTe P 213 2 3
02.12.03.12 Maslovite PtBiTe P 213 2 3
02.12.03.13 Testibiopalladite PdTe(Sb,Te) P 213 2 3
02.12.03.14 Changchengite! IrBiS P 213 2 3
02.12.03.15 Milotaite! PdSbSe P 21/3 2 3
02.12.03.16 Kalungaite! PdAsSe Pa3 2/m 3
Strunz Class:
02.EB.25 02 - SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulf
02.E - Metal Sulfides, M:S � 1:2
02.EB -M:S = 1:2, with Fe, Co, Ni, PGE, etc.
02.EB.25 Cobaltite CoAsS P ca21 mm2
02.EB.25 Changchengite! IrBiS P 213 2 3
02.EB.25 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3
02.EB.25 Gersdorffite NiAsS P 213 2 3
02.EB.25 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3
02.EB.25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3
02.EB.25 Krutovite NiAs2 P a3 2/m 3
02.EB.25 Michenerite (Pd,Pt)BiTe P 213 2 3
02.EB.25 Maslovite PtBiTe P 213 2 3
02.EB.25 Mayingite IrBiTe P a3 2/m 3
02.EB.25 Padmaite PdBiSe P 213 2 3
02.EB.25 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3
02.EB.25 Ullmannite NiSbS P 213 2 3
02.EB.25 Tolovkite IrSbS P 213 2 3
02.EB.25 Testibiopalladite PdTe(Sb,Te) P 213 2 3
02.EB.25 Willyamite (Co,Ni)SbS P 213 2 3
02.EB.25 Kalungaite! PdAsSe Pa3 2/m 3
02.EB.25 Milotaite! PdSbSe P 21/3 2 3
Other Irarsite Information
References:
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)
See Also:
Links to other databases for Irarsite :
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
15 - WWW-MINCRYST
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Print or Cut-and-Paste your Irarsite Specimen Label here :
Irarsite
(Ir,Ru,Rh,Pt)AsS
Dana No: 02.12.03.07 Strunz No: 02.EB.25
Locality:
Notes: