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The usual variety of native platinum is polyxene. It is 80 to 90 per cent platinum, with 3 to 11 per cent iron, in addition to the other platinum group metals as well as gold, copper and nickel. Native platinum is the primary ore of platinum. However, platinum may also be obtained from the very rare native alloy platiniridium. Moreover, it may be found combined with arsenic as sperrylite mineral and with sulfur as cooperite mineral, being also associated with minerals as chromite and olivine.