Erlichmanite
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]
| Erlichmanite | |
|---|---|
| General | |
| Category | Pyrite |
| Formula (repeating unit) | OsS2 |
| IMA symbol | Erl[1] |
| Strunz classification | 2/D.17-110 |
| Dana classification | 2.12.1.16 |
| Crystal system | Isometric |
| Crystal class | Diploidal |
| Unit cell | 177.47 ų |
| Identification | |
| Formula mass | 254.33gm |
| Colour | Grey |
| Crystal habit | Pyritohedral crystals or grains |
| Mohs scale hardness | 4.5-5.5 |
| Luster | Metallic |
| Diaphaneity | Opaque |
| Specific gravity | 8.28 |
| Density | 8.28 g/cm3 (Measured), 9.59 g/cm3 (Calc) |
| Pleochroism | Non-pleochromic |
| Common impurities | Iridium, Rhodium, Ruthenium, Paladium |
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
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