Wilkmanite
Wilkmanite is an IMA-recognized mineral species in the sulfide class, with the chemical formula Ni₃Se₄.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Wilkmanite structural group.
Key properties: specific gravity 6.96.
IMA symbol Wkm, IMA status: approved, named in 1964.
A primary phase and an alteration product of sederholmite, in albite diabase sills that cut a schist formation, in association with low-grade uranium mineralization.
It is found associated with Sederholmite, penroseite, selenium, ferroselite, selenian vaesite, cattierite, calcite.
The name refers to W.W. Wilkman, geologist.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
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