Platinum

native element

olivine

Formula: Pt native element
Specific gravity: 21.4
Hardness: 4 to 4½;
Streak: Grey
Colour: Silver grey
Solubility: Insoluble in hydrochloric, sulphuric and nitric acid
Environments:

Sedimentary environments
Placer deposits
Hydrothermal environments

Most platinum occurs as the native metal in ultramafic rocks, especially dunite, associated with olivine, chromite, pyroxene and magnetite. It has been mined extensively in placers which are usually close to the platinum-bearing parent rock. It also occurs in quartz veins.

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