Osarsite
Osarsite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula OsAsS.
It crystallizes in the monoclinic crystal system. It is a member of the Arsenopyrite structural group.
Key properties: specific gravity 8.44; Metallic. Anisotropism: Weak but distinct in air. R1 –R2: n.d luster.
IMA symbol Osa, IMA status: approved, named in 1971.
Found in a platinum-bearing sample of placer sand (Gold Bluff, California, USA).
It is found associated with Irarsite, ruthenarsenite, sperrylite, iridarsenite, osmiridium, anduoite, laurite, ruarsite.
The name refers to the content of OSmium and ARSenic.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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