Irarsite
A valid IMA mineral species
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About Irarsite
Formula:
(Ir,Ru,Rh,Pt)AsS
Colour:
Iron black
Lustre:
Metallic
Hardness:
6½
Specific Gravity:
11.92 (Calculated)
Crystal System:
Isometric
Member of:
Name:
The name reflects its composition: iridium, arsenic and sulfur. The related minerals osarsite, ruarsite, and platarsite are similarly named.
Unique Identifiers
Mindat ID:
2042
Long-form identifier:
mindat:1:1:2042:4
IMA Classification of Irarsite
Approved
IMA Formula:
Ir3+(AsS)3-
Approval year:
1966
First published:
1966
Approval history:
IMA1966-028
Classification of Irarsite
2.EB.25
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
B : M:S = 1:2, with Fe, Co, Ni, PGE, etc.
2.12.3.7
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.12.64
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
12 : Sulphides etc. of the platinum metals
3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
12 : Sulphides etc. of the platinum metals
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Irs | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
| Irs | The Canadian Mineralogist (2019) | The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download |
Physical Properties of Irarsite
Metallic
Transparency:
Opaque
Colour:
Iron black
Hardness:
6½ on Mohs scale
Hardness:
VHN100=976 - Vickers
Tenacity:
Brittle
Density:
11.92 g/cm3 (Calculated)
Optical Data of Irarsite
Reflectivity:
| Wavelength | R1 (%) |
|---|---|
| 400nm | 47.6% |
| 440nm | 47.0% |
| 480nm | 46.6% |
| 520nm | 46.2% |
| 560nm | 45.6% |
| 600nm | 45.1% |
| 640nm | 44.6% |
| 680nm | 44.0% |
| 700nm | 43.7% |
Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 47.6%.
Colour in reflected light:
grayish-white, with a bluish tint
Chemistry of Irarsite
Mindat Formula:
(Ir,Ru,Rh,Pt)AsS
Element Weights:
Common Impurities:
Os,Fe
Chemical Analysis
wt%
| 1 | |
|---|---|
| Ir | 44.8 % |
| Pt | 7.8 % |
| Os | 2.2 % |
| Rh | 3.8 % |
| Pd | 1.2 % |
| Co | 1.4 % |
| As | 24.7 % |
| S | 12.3 % |
| Ni | 0.19 % |
| Total: | 98.39 % |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Werner Lake Mine, Werner Lake Area, Kenora District, Ontario, Canada | EMPA analysis of a minute grain in massive sulphide drill cores |
Crystallography of Irarsite
Crystal System:
Isometric
Class (H-M):
m3(2/m3) - Diploidal
Space Group:
Pa3
Setting:
Pa3
Cell Parameters:
a = 5.777 Å
Unit Cell V:
192.80 ų (Calculated from Unit Cell)
Z:
1
Morphology:
As grains, to 1 mm,
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.32 Å | (100) |
| 2.87 Å | (100) |
| 1.74 Å | (100) |
| 2.04 Å | (90) |
| 1.112 Å | (90) |
| 2.57 Å | (80) |
| 1.021 Å | (80) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 2: Planetesimal differentiation and alteration | 4.566-4.550 |
| 6 : Secondary asteroid phases | 4.566-4.560 |
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 37 : Layered igneous intrusions and related PGE minerals |
Geological Setting:
Mineralogical Museum, Acad. Sci., USSR, Moscow.
Type Occurrence of Irarsite
Geological Setting of Type Material:
Associated with chromite in hortonolite dunite
Associated Minerals at Type Locality:
Synonyms of Irarsite
Other Language Names for Irarsite
Relationship of Irarsite to other Species
Member of:
Other Members of Cobaltite Group:
| Andrieslombaardite | RhSbS | Iso. 23 : P213 |
| Changchengite | IrBiS | Iso. 23 : P213 |
| Cobaltite | CoAsS | Orth. mm2 : Pca21 |
| Gersdorffite | NiAsS | Iso. 23 : P213 |
| Guixiangite | NiBiS | Iso. 23 : P213 |
| Hollingworthite | (Rh,Pt,Pd)AsS | Iso. m3(2/m3) : Pa3 |
| Jolliffeite | NiAsSe | Iso. m3(2/m3) : Pa3 |
| Kalungaite | PdAsSe | Iso. m3(2/m3) : Pa3 |
| Maslovite | PtBiTe | Iso. 23 : P213 |
| Mayingite | IrBiTe | Iso. m3(2/m3) : Pa3 |
| Michenerite | PdBiTe | Iso. 23 : P213 |
| Milotaite | PdSbSe | Iso. 23 : P213 |
| Padmaite | PdBiSe | Iso. 432 |
| 'Platarsite' | Pt(As,S)2 | Iso. m3(2/m3) : Pa3 |
| Sulfopadmaite | PdBiS | Iso. 23 : P213 |
| Testibiopalladite | PdSbTe | Iso. |
| Tolovkite | IrSbS | Iso. |
| Ullmannite | NiSbS | Iso. 23 : P213 |
| 'UM1991-19-Se:AsCo' | (Co,Ni)AsSe | Iso. m3(2/m3) : Pm3 |
| Willyamite | CoSbS |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 7 photos of Irarsite associated with Laurite | RuS2 |
| 5 photos of Irarsite associated with Hollingworthite | (Rh,Pt,Pd)AsS |
| 4 photos of Irarsite associated with 'Iridosmine' | (Os,Ir) |
| 3 photos of Irarsite associated with Sperrylite | PtAs2 |
| 3 photos of Irarsite associated with Spinel | MgAl2O4 |
| 2 photos of Irarsite associated with Tolovkite | IrSbS |
| 1 photo of Irarsite associated with Native Iridium | (Ir,Os,Ru) |
| 1 photo of Irarsite associated with Inaglyite | Cu3Pb(Ir,Pt)8S16 |
| 1 photo of Irarsite associated with Rutheniridosmine | (Ir,Os,Ru) |
| 1 photo of Irarsite associated with Native Platinum | Pt |
Related Minerals - Strunz-mindat Grouping
| 2.EB. | Selenolaurite | RuSe2 |
| 2.EB. | Andrieslombaardite | RhSbS |
| 2.EB. | Iridarsenite | (Ir,Ru)As2 |
| 2.EB. | Kanatzidisite | (SbBiS3)2Te2 |
| 2.EB.05a | Vaesite | NiS2 |
| 2.EB.05a | Hauerite | MnS2 |
| 2.EB.05a | Laurite | RuS2 |
| 2.EB.05a | Gaotaiite | Ir3Te8 |
| 2.EB.05a | Penroseite | (Ni,Co,Cu)Se2 |
| 2.EB.05a | Fukuchilite | Cu3FeS8 |
| 2.EB.05a | Villamanínite | (Cu,Ni,Co,Fe)S2 |
| 2.EB.05a | Erlichmanite | OsS2 |
| 2.EB.05a | Sperrylite | PtAs2 |
| 2.EB.05a | Geversite | PtSb2 |
| 2.EB.05a | Cattierite | CoS2 |
| 2.EB.05a | Aurostibite | AuSb2 |
| 2.EB.05a | Trogtalite | CoSe2 |
| 2.EB.05a v | 'Cayeuxite' | |
| 2.EB.05a | Kruťaite | CuSe2 |
| 2.EB.05a | Pyrite | FeS2 |
| 2.EB.05a | Insizwaite | PtBi2 |
| 2.EB.05b | Bambollaite | Cu(Se,Te)2 |
| 2.EB.05a | Dzharkenite | FeSe2 |
| 2.EB.10a | Marcasite | FeS2 |
| 2.EB.10e | Paracostibite | CoSbS |
| 2.EB.10f | Oenite | CoSbAs |
| 2.EB.10e | Pararammelsbergite | NiAs2 |
| 2.EB.10a | Mattagamite | CoTe2 |
| 2.EB.10a | Frohbergite | FeTe2 |
| 2.EB.10d | Costibite | CoSbS |
| 2.EB.10b | Alloclasite | Co1-xFexAsS |
| 2.EB.10c | Glaucodot | (Co0.50Fe0.50)AsS |
| 2.EB.10a | Petříčekite | CuSe2 |
| 2.EB.10a | Kullerudite | NiSe2 |
| 2.EB.10a | Ferroselite | FeSe2 |
| 2.EB.15b | Seinäjokite | FeSb2 |
| 2.EB.15a | Rammelsbergite | NiAs2 |
| 2.EB.15a | Clinosafflorite | CoAs2 |
| 2.EB.15c | Paxite | CuAs2 |
| 2.EB.15a | Nisbite | NiSb2 |
| 2.EB.15a | Löllingite | FeAs2 |
| 2.EB.15a | Safflorite | (Co,Ni,Fe)As2 |
| 2.EB.15a | Omeiite | OsAs2 |
| 2.EB.15a | Anduoite | RuAs2 |
| 2.EB.20 | Arsenopyrite | FeAsS |
| 2.EB.20 | Ruarsite | (Ru,Os)AsS |
| 2.EB.20 | Osarsite | (Os,Ru)AsS |
| 2.EB.20 | Gudmundite | FeSbS |
| 2.EB.25 | Mayingite | IrBiTe |
| 2.EB.25 | Maslovite | PtBiTe |
| 2.EB.25 | Paragersdorffite | Ni(As,S)2 |
| 2.EB.25 | Orthogersdorffite | NiAsS |
| 2.EB.25 | Sulfopadmaite | PdBiS |
| 2.EB.25 | Jolliffeite | NiAsSe |
| 2.EB.25 | Cobaltite | CoAsS |
| 2.EB.25 | Guixiangite | NiBiS |
| 2.EB.25 | Testibiopalladite | PdSbTe |
| 2.EB.25 va | 'Antimony-bearing Gersdorffite' | Ni(As,Sb)S |
| 2.EB.25 | Kalungaite | PdAsSe |
| 2.EB.25 | Hollingworthite | (Rh,Pt,Pd)AsS |
| 2.EB.25 | Michenerite | PdBiTe |
| 2.EB.25 | Gersdorffite | NiAsS |
| 2.EB.25 | Milotaite | PdSbSe |
| 2.EB.25 | Tolovkite | IrSbS |
| 2.EB.25 | 'Platarsite' | Pt(As,S)2 |
| 2.EB.25 | Willyamite | CoSbS |
| 2.EB.25 | Changchengite | IrBiS |
| 2.EB.25 | Kvačekite | NiSbSe |
| 2.EB.25 | Krutovite | NiAs2 |
| 2.EB.25 | Padmaite | PdBiSe |
| 2.EB.25 | Ullmannite | NiSbS |
| 2.EB.30 | Urvantsevite | Pd(Bi,Pb)2 |
| 2.EB.35 | Rheniite | ReS2 |
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Irarsite
mindat.org URL:
https://www.mindat.org/min-2042.html
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References for Irarsite
Reference List:
Fleischer, Michael, Pabst, Adolf, Mandarino, Joseph A., Chao, George Y., Cabri, Louis, J. (1976) New Mineral Names. American Mineralogist, 61 (1-2) 174-186
Localities for Irarsite
Showing 254 localities.
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
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Goodnews Bay, Bethel Census Area, Alaska, USA