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Formula: Ni(SO4).H2O
Hydrated nickel sulphate, kieserite group
Crystal System: Monoclinic
Specific gravity: 3.34 calculated
Hardness: 2 to 3
Streak: White
Colour: White, faint greenish tint (perhaps from impurities)
Environments
Localities
At the type locality, the Ragra Mine, Huayllay District, Pasco Province, Pasco, Peru, dwornikite was found as
white aggregates of very fine-grained particles in a vanadium sulphide deposit,
probably formed by oxidation of associated bravoite. No single crystals were
found. Associated minerals
include patronite, bravoite,
sulphur, retgersite,
szomolnokite and bitumen
(MM 46.351-355, HOM, Mindat)
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