Irarsite Mineral Data

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:

Ir_0.4Ru_0.3Rh_0.2Pt_0.1AsS

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:

Ruthenarsenite Irarsite

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 - Diploidal H-M Symbol (2/m 3) Space Group: P a3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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**
Relative Intensity	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:

PE_Irarsite= 614.75 barns/electron
U=PE_Irarsite 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 ï¿½ 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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Irarsite

(Ir,Ru,Rh,Pt)AsS
Dana No: 02.12.03.07 Strunz No: 02.EB.25
Locality:

Notes:

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