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Formula: NiSe
Selenide of nickel,
nickeline group,
paramorph of mäkinenite
Crystal System: Hexagonal
Specific gravity: 7.11 calculated
Hardness: 2½ to 3
Colour: Brass-yellow to orange-yellow
Common impurities: Co
Environments
Metamorphic environments
Hydrothermal environments
Although data on
Localities
At the type locality, the Kitka River Valley, Kuusamo, North Ostrobothnia, Finland, sederholmite was found
in penroseite clusters of a few millimeters in diameter, in
calcite veins containing nickel
selenides, in sills of
albitite dolerite in
schist, associated with low-grade uranium mineralisation. Associated
minerals include wilkmanite,
penroseite, clausthalite and
calcite
(HOM, Mindat).
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