Sulfide mineral
(repeating unit)OsS2 | IMA symbol | Erl[1] |
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Strunz classification | 2/D.17-110 |
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Dana classification | 2.12.1.16 |
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Crystal system | Isometric |
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Crystal class | Diploidal |
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Unit cell | 177.47 ų |
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Identification |
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Formula mass | 254.33gm |
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Colour | Grey |
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Crystal habit | Pyritohedral crystals or grains |
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Mohs scale hardness | 4.5-5.5 |
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Luster | Metallic |
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Diaphaneity | Opaque |
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Specific gravity | 8.28 |
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Density | 8.28 g/cm3 (Measured), 9.59 g/cm3 (Calc) |
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Pleochroism | Non-pleochromic |
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Common impurities | Iridium, Rhodium, Ruthenium, Paladium |
Erlichmanite is the naturally occurring mineral form of osmium sulfide (OsS2). It is grey with a metallic luster, hardness around 5, and specific gravity about 9.[2] It is found in noble metal placer deposits.[3] Named for Jozef Erlichman, electron microprobe analyst at the NASA Ames Research Center.[4]
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ "Erlichmanite".
- ^ "Erlichmanite Mineral Data".
- ^ http://www.handbookofmineralogy.org/pdfs/erlichmanite.pdf [bare URL PDF]