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Erlichmanite

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Sulfide mineral
Erlichmanite
General
CategoryPyrite
Formula
(repeating unit)		OsS2
IMA symbolErl
Strunz classification2/D.17-110
Dana classification2.12.1.16
Crystal systemIsometric
Crystal classDiploidal
Unit cell177.47 ų
Identification
Formula mass254.33gm
ColourGrey
Crystal habitPyritohedral crystals or grains
Mohs scale hardness4.5-5.5
LusterMetallic
DiaphaneityOpaque
Specific gravity8.28
Density8.28 g/cm3 (Measured), 9.59 g/cm3 (Calc)
PleochroismNon-pleochromic
Common impuritiesIridium, 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. It is found in noble metal placer deposits. Named for Jozef Erlichman, electron microprobe analyst at the NASA Ames Research Center.

References

  1. 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.
  2. "Erlichmanite".
  3. "Erlichmanite Mineral Data".
  4. http://www.handbookofmineralogy.org/pdfs/erlichmanite.pdf
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