Nickelzippeite
Nickelzippeite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Ni₂(UO₂)₆(SO₄)₃(OH)₁₀·16H₂O.
It is a member of the Zippeite structural group.
Key properties: Mohs hardness 2; specific gravity 3.3; optically biaxial.
IMA symbol Nizip, IMA status: approved, named in 1971.
Typically as secondary coatings on mine walls, derived from oxidation of uranium-bearing primary Ni–Co sulfides.
It is found associated with Cobalt-zippeite, sodium-zippeite, zippeite, johannite, uranopilite, zeunerite, schröckingerite, bayleyite, chalcanthite, antlerite, siderotil, bieberite.
The name refers to its dominant content of nickel and relation to other zippeite group species.
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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