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.

It occurs in South Africa in minable quantities and in 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.

This article about a specific sulfide mineral is a stub.