Chemistry:Cooperite (mineral)

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Short description: Sulfide mineral
Cooperite
Cooperite.jpg
Cooperite specimen from Tulameen River, Princeton, British Columbia, Canada
General
CategoryMineral
Formula
(repeating unit)
PtS (also PdS, NiS)
Strunz classification2.CC.35b
Dana classification2.8.5.1
Crystal systemTetragonal
Crystal classTetragonal - Ditetragonal dipyramidal
Space groupP42/mmc (No. 131)
Unit cell73.57 ų (Calculated from Unit Cell)
Identification
ColourSteel gray
TwinningOccasional
FractureConchoidal
Mohs scale hardness4-5
|re|er}}Metallic
DiaphaneityOpaque
Specific gravity9.5
Density9.5 g/cm3 (Measured), 10.2 g/cm3 (Calculated)
PleochroismVisible: white to creamy white or bluish white
Major varieties
FormDistorted crystal fragments, irregular grains to 1.5mm

Cooperite is a grey mineral consisting of platinum sulfide (PtS), generally in combinations with sulfides of other elements such as palladium and nickel (PdS and NiS). Its general formula is (Pt,Pd,Ni)S. It is a dimorph of braggite.[2]

It is mined as an ore of platinum and platinum group metals such as palladium. It occurs in South Africa in minable quantities and an old mine near Mount Washington on Vancouver Island.[3]

It was first described in 1928 for occurrences in the Bushveld Igneous Complex and named after South African metallurgist Richard A. Cooper who first characterized it.[2][4]

See also

References