Platinum nugget from Russia. Platinum (PGE) sulfide ore a mineral containing platinum,palladium and rhodium and primarily found in Ni-Cu-Cr- PGE. deposits. These deposits from when mantle-derived magmas become saturated with sulfide leading to the segregation of an immiscible sulfide liquid and are commonly associated with with mafic and ultramafic rocks. Non magnetic. Tested with hydrogen peroxide an immediate reaction is catalysed.