Erlichmanite
Appearance
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 |
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]