Erlichmanite

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Erlichmanite
General
CategoryPyrite
Formula
(repeating unit)		OsS2
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.[1] It is found in noble metal placer deposits.[2] Named for Jozef Erlichman, electron microprobe analyst at the NASA Ames Research Center.[3]

References[]

  1. ^ https://www.mindat.org/min-1401.html
  2. ^ http://www.webmineral.com/data/Erlichmanite.shtml
  3. ^ http://www.handbookofmineralogy.org/pdfs/erlichmanite.pdf
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