Dunite is a plutonic ultramafic igneous rock consisting almost entirely of olivine. Consequently, its color is the light green of peridot. Individual crystals are generally visible, as either the dunite cooled slowly enough to allow crystals to form, or the olivine crystals may have settled to the bottom of a large magma body.

Dunite can weather to the metamorphic rocks serpentinite and soapstone.
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