Nickelpicromerite
Nickelpicromerite is an IMA-recognized mineral species in the sulfate class, with the chemical formula K₂Ni(SO₄)₂·6H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Picromerite structural group.
Key properties: Mohs hardness 2–2.5; specific gravity 2.2; White streak; Vitreous luster; optically biaxial.
IMA symbol Npmr, IMA status: approved, named in 2012.
Found as a secondary mineral in the fractures of slightly weathered actinolite-talc schist containing partially vermiculitized biotite and partially altered, nickle-bearing sulfides.
It is found associated with Gypsum, goethite.
The name refers to a member of the picromerite group with essential nickel.
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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