Cobaltzippeite
Cobaltzippeite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Co(UO₂)₂(SO₄)O₂·3.5H₂O.
It crystallizes in the monoclinic crystal system (space group C2/m). It is a member of the Zippeite structural group.
Key properties: Mohs hardness 2; specific gravity 3.3; optically biaxial.
IMA symbol Czip, IMA status: approved, named in 1971.
Rarely as efflorescences on the mine walls in oxidized portions of a uraninite deposit containing gersdorffite.
It is found associated with Sodium-zippeite, uranopilite, johannite, zeunerite, chalcanthite, antlerite, siderotil, bieberite, erythrite, epsomite, gypsum.
The name refers to its dominant content of cobalt 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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