Heazlewoodite, Ni3S2, is a rare sulfur-poor nickel sulfide mineral found in serpentinitized dunite.

[4] Heazlewoodite is formed within terrestrial rocks by metamorphism of peridotite and dunite via a process of nucleation.

In this environment, nickel sulfide mineralogy converts to the lowest-sulfur state available, which is heazlewoodite.

The Honeymoon Well ultramafic intrusive, Western Australia is known to contain heazlewoodite-millerite sulfide assemblages within serpentinized olivine adcumulate dunite, formed from the metamorphic process.

This mineral has been found in meteorites[5] including irons[6] and CV carbonaceous chondrites.