Beshtauite
Beshtauite is an IMA-recognized mineral species in the sulfate class, with the chemical formula (NH₄)₂(UO₂)(SO₄)₂·2H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 2; specific gravity 3.046; White streak; Vitreous luster; optically biaxial.
IMA symbol Bes, IMA status: approved, named in 2012.
Found as a secondary mineral in the oxidation zone of a hydrothermal vein-type uranium deposit in porphyritic granite.
It is found associated with Rozenite, gypsum, lermontovite, marcasite, pyrite, halloysite, opal.
The name refers to the mine that yielded the first specimens.
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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