Urancalcarite
Urancalcarite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Ca(UO₂)₃(CO₃)(OH)₆·3H₂O.
It crystallizes in the orthorhombic crystal system.
Key properties: Mohs hardness 2–3; specific gravity 4.03; Vitreous luster; optically biaxial.
IMA symbol Uca, IMA status: approved, named in 1983.
Found in the oxidation zone of uranium deposits.
It is found associated with Uraninite, uranophane, wyartite, masuyite (Shinkolobwe, Congo); fourmarierite, vandendriesscheite, studtite, uranophane-beta, rutherfordine (Hunan Province.
The name refers to URANium, CALcium, and CARbonate in the composition.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more U minerals or help write this entry.