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Formula: CoNi2S4
Sulphide, linnaeite subgroup,
thiospinel group,
spinel supergroup,
forms a series with
violarite and with linnaeite,
cobalt- and nickel- bearing mineral
Crystal System: Isometric
Specific gravity: 4.5 to 4.8 measured, 4.83 calculated
Hardness: 4½ to 5½
Streak: Greyish black
Colour: Light to steel-grey, violet-grey (tarnished)
Common impurities: Se,Cu,Fe
Environments
Siegenite occurs in hydrothermal veins associated with chalcopyrite,
pyrrhotite, galena,
sphalerite, pyrite,
millerite, gersdorffite and
ullmannite
(HOM).
Localities
At the Langis mine, Casey Township, Cobalt Area, Cobalt-Gowganda region, Timiskaming District, Ontario, Canada, most
of the siegenite in this occurrence is intimately intergrown with
cobaltpentlandite, although some is also present as separate grains
(CM 9.5.597–616).
The type locality is the Stahlberg mine, Müsen, Hilchenbach, Siegen-Wittgenstein, Arnsberg, North Rhine-Westphalia,
Germany.
Siegenite from the Stahlberg mine - Image
At the Emma-Hendrik coal dump, Brunssum, Limburg, Netherlands, siegenite has been found on
ankerite
(Mindat photo).
Siegenite from the Emma-Hendrik coal dump -
Image
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