Pseudomarkeyite
Pseudomarkeyite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Ca₈(UO₂)₄(CO₃)₁₂(H₂O)₁₈·3H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: Mohs hardness 1; specific gravity 2.88; White streak; Vitreous, pearly. - luster; optically biaxial.
IMA symbol Pmk, IMA status: approved, named in 2019.
Secondary phase on asphaltum in sandstones by oxidation of primary uraninite, montroseite and coffinite in a humid underground environment.
It is found associated with Calcite, gypsum, markeyite.
The prefix indicates the similarity in appearance to markeyite, named for the Markey mine.
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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