Irarsite Mineral Data

Irarsite Mineral Data +

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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.

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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

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

By Intensity(I/I_o): 1.74(1), 2.87(1), 3.32(1),

Physical Properties of Irarsite

Color:

Iron black.

Diaphaniety:

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:

r_electron=9.46 gm/cc
note: r_Irarsite=11.0 gm/cc.

Fermion Index

Fermion Index = 0.0624
Boson Index = 0.9376

Photoelectric:

PE_Irarsite= 614.75 barns/electron
U=PE_Irarsite x r_electron=5,813.33 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Irarsite is Not Radioactive

Irarsite Classification

Dana Class:

2.12.3.7 (2)Sulfides - Including Selenides and Tellurides

(2.12)where Am Bn Xp, with (m+n):p=1:2

(2.12.3)Cobaltite Group (Cubic or pseudocubic crystals)

2.12.3.1 Cobaltite CoAsS P ca2₁ mm2

2.12.3.2 Gersdorffite NiAsS P 2₁3 2 3

2.12.3.3 Ullmannite NiSbS P 2₁3 2 3

2.12.3.4 Willyamite (Co,Ni)SbS P 2₁3 2 3

2.12.3.5 Tolovkite IrSbS P 2₁3 2 3

2.12.3.6 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

2.12.3.7 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

2.12.3.8 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

2.12.3.9 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

2.12.3.10 Padmaite PdBiSe P 2₁3 2 3

2.12.3.11 Michenerite (Pd,Pt)BiTe P 2₁3 2 3

2.12.3.12 Maslovite PtBiTe P 2₁3 2 3

2.12.3.13 Testibiopalladite PdTe(Sb,Te) P 2₁3 2 3

2.12.3.14 Changchengite! IrBiS P 2₁3 2 3

2.12.3.15 Milotaite! PdSbSe P 2₁/3 2 3

2.12.3.16 IMA2004-047! PdAsSe Pa3 4/m 2/m 2/m

Strunz Class:

II/D.18-60 II - Sulfides and sulphosalts

II/D - Sulfides with metal: sulfur, selenium and tellurium < 1:1, Tellurides with Copper, Silver, Gold

II/D.18 - Cobaltite group, Cobaltite - Ullmannite - Tolovkite series

II/D.18-10 Cobaltite CoAsS P ca2₁ mm2

II/D.18-20 Gersdorffite NiAsS P 2₁3 2 3

II/D.18-25 Jolliffeite (Ni,Co)AsSe P a3 2/m 3

II/D.18-30 Willyamite (Co,Ni)SbS P 2₁3 2 3

II/D.18-40 Ullmannite NiSbS P 2₁3 2 3

II/D.18-50 Hollingworthite (Rh,Pt,Pd)AsS P a3 2/m 3

II/D.18-60 Irarsite (Ir,Ru,Rh,Pt)AsS P a3 2/m 3

II/D.18-70 Platarsite (Pt,Rh,Ru)AsS P a3 2/m 3

II/D.18-80 Tolovkite IrSbS P 2₁3 2 3

Other Irarsite Information

References:

NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1)

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Irarsite

(Ir,Ru,Rh,Pt)AsS
Dana No: 2.12.3.7 Strunz No: II/D.18-60
Locality:

Notes: