High Quality Content by WIKIPEDIA articles! Heazlewoodite, Ni3S2, is a rare sulfur-poor nickel sulfide mineral found in serpentinitized dunite. It occurs as disseminations and masses of opaque, metallic light bronze to brassy yellow grains which crystallize in the trigonal crystal system. It has a hardness of 4, a specific gravity of 5.82, and a Strunz classification II/B.12-40. Heazlewoodite was first described in 1896 from Heazlewood, Tasmania, Australia.