Shandite

shandite

heazlewoodite

pentlandite

altaite

Images

Formula: Ni3Pb2S2
Sulphide of nickel and lead
Specific gravity: 8.72
Hardness: 4
Colour: Brass-yellow
Common impurities: Zn,Fe,Co,Mn
Environments

Igneous environments
Metamorphic environments

Localities

At the type locality, the Nickel Reward mine, Trial Harbour district, West Coast municipality, Tasmania, Australia, shandite occurs in serpentine associated with heazlewoodite, pentlandite, sphalerite, chromite and magnetite (HOM).

At Kitdlît, Disko Island, Qeqertalik, Greenland, shandite occurs in segregations in an iron-rich lens in basalt, associated with galena, altaite, lead, iron and troilite (HOM).

At the Isua belt, Nuuk, Sermersooq, Greenland, shandite has been identified in a metadunite. It forms a thin continuous rim on heazlewoodite which, in addition, contains patches of cobalt-rich pentlandite. Magnesium- and nickel- rich magnetite is associated with these sulphide aggregates as well. The shandite is interpreted to have formed during prograde metamorphism of serpentinite from a pentlandite precursor phase, by a continuous reaction that involved desulphidation and oxidation of iron. The lead needed to form shandite may have been present in the precursor phase, or it was extracted from the environment during reaction (CM.25.245-249).

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