Natromarkeyite
Natromarkeyite is an IMA-recognized mineral species in the carbonate class, with the chemical formula Na₂Ca₈(UO₂)₄(CO₃)₁₃(H₂O)₂₄·3H₂O.
It crystallizes in the orthorhombic crystal system (space group Pmmn). It is a member of the Markeyite structural group.
Key properties: Mohs hardness 1.5–2; specific gravity 2.7; White streak; Vitreous, pearly luster; optically biaxial.
IMA symbol Nmk, 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 Andersonite, calcite, gypsum.
The prefix indicates the sodium-analogue of 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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