Siegenite

minerals

millerite

gersdorffite

ullmannite

Formula: CoNi2S4
Sulphide, linnaeite group, forms a series with violarite and with linnaeite
Specific gravity: 4.5 to 4.8
Hardness: 4½ to 5½
Streak: Greyish black
Colour: Light to steel-grey, violet-grey (tarnished)
Environments

Hydrothermal environments

Siegenite occurs in hydrothermal veins associated with chalcopyrite, pyrrhotite, galena, sphalerite, pyrite, millerite, gersdorffite and ullmannite (HOM).

Localities

The type locality is the Stahlberg mine), Müsen, Hilchenbach, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia, Germany.

Common impurities: Se,Cu,Fe

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