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Platinum Group Metals

Called the ?noble metals? because they are among the scariest of the metallic elements; more important, they are totally imperious to oxidation or corrosion. The family is six metals: Platinum, a white infusible metal with high electrical resistance; Palladium, also white, noted for its strength and high ductility; Iridium, a yellowish mineral with the most corrosion resistance of any metal known; Rhodium, a silver white metal also found with nickel; Ruthenium, a white metal noted for its hardness; and osmium, a bluish white metal that is so hard it is difficult to fabricate.