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Formula: Ni2+Ni3+2S4
Sulphide, linnaeite subgroup,
thiospinel group,
spinel supergroup,
forms a series with
linnaeite, nickel-bearing mineral
Specific gravity: 4.5 to 4.8
Hardness: 4½ to 5½
Streak: Black-grey
Colour: Violet-grey, copper-red, light grey, steel-grey
Common impurities: Fe,Co
Environments
Polydymite occurs in hydrothermal veins associated with
chalcopyrite,
pyrrhotite, pyrite,
millerite, gersdorffite,
ullmannite, sphalerite,
galena, bismuthinite,
quartz and siderite
(HOM).
Localities
The type locality is the Grüneau Mine, Schutzbach, Daaden-Herdorf, Altenkirchen District, Rhineland-Palatinate, Germany.
At Hamilton, Hancock county, Illinois, USA, polydymite has been confirmed as inclusions in
calcite
(Minrec 36.5.427).
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