Sperrylite

Formula	PtAs2
Origin	Noril´sk  (Russia)
Description	Silvery well-formed crystals in chalcopyrite.
Classification (Lapis)	Sulfides
Crystal System	Cubic
Hardness	6,0 – 7,0
Colour	Tin-white
Streak	Black
Luminescence
Lustre	Metallic
Transparency (Opacity)	opaque
Cleavage	indistinct
Fracture	conchoidal
Magnetism	negative
Geological Setting	The most widespread platinum mineral, occurring in every type of deposit
Specific Gravity	10,78 g/cm3