Platinum-group minerals in Tasmania occur mostly in placer deposits and are composed mainly of iridosmine and rutheniridosmine. Platinum-rich alloys are rare. Silicate inclusions in the metals include olivine (Fo (sub 94-89) ), enstatite, and nonstoichiometric pyroxene rich in Ca, Mg, and Al. The silicate compositions confirm a genetic association between the platinum-group minerals and ultramafic rocks, already suspected from their distributions.

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