Paramarkeyite
Paramarkeyite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Ca₂(UO₂)(CO₃)₃·5H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/n).
Key properties: Mohs hardness 2.5; specific gravity 2.91; White streak; Vitreous luster; optically biaxial.
IMA status: approved, named in 2021.
Occurs as efflorescent crusts on the surfaces of mine walls. A secondary phase on gypsum- coated asphaltum.
It is found associated with Andersonite, calcite, gypsum, natromarkeyite.
Its name comes from the Greek παρα for ‘near’ and the mineral markeyite to which it is similar.
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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