Hydrombobomkulite
Hydrombobomkulite is an IMA-recognized mineral species in the nitrate class, with the chemical formula (Ni,Cu)Al₄(NO₃,SO₄)₂(OH)₁₂·14H₂O.
It crystallizes in the monoclinic crystal system. It is a member of the Chalcoalumite structural group.
IMA symbol Hmbb, IMA status: approved, named in 1979.
By the interaction of solutions of nickel sulfate from weathering Cu–Ni-bearing sulfides with aluminosilicate minerals and nitrate derived from bat guano (Mbobo Mkulu Cave, South Africa); in a sedimentary U–V deposit (Jomac mine, Utah.
It is found associated with Allophane, mbobomkulite, chalcoalumite (Mbobo Mkulu Cave, South Africa); oswaldpeetersite, cuprite, antlerite, goethite, lepidocrocite, mbobomkulite.
As the hydrated equivalent of mbobomkulite.
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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