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Formula: Ni3Se4
Selenide of nickel
Crystal System: Mooclinic
Specific gravity: 6.96 calculated
Hardness: 2½
Colour: Yellow-grey
Common impurities: Co,Cu,Fe
Environments
Metamorphic environments
Hydrothermal environments
Although wilkmanite was first described prior to 1959, to date (July 2024) it has been reported only from the type
locality.
Localities
At the type locality, the Kitka River Valley, Kuusamo, North Ostrobothnia, Finland, wilkmanite is a
primary phase and an alteration product of
sederholmite, in albite
dolerite sills that cut a
schist formation, associated with low-grade
uranium mineralisation. Associated minerals include
sederholmite, penroseite,
selenium, ferroselite,
selenium-rich vaesite,
cattierite and calcite
(HOM).
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