Phosphowalpurgite
Phosphowalpurgite is an IMA-recognized mineral species in the phosphate class, with the chemical formula (UO₂)Bi₄O₄(PO₄)₂·2H₂O.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 5; specific gravity 6.36; Light brownish grey streak; Vitreous to adamantine luster.
IMA symbol Pwal, IMA status: approved, named in 2001.
A secondary mineral formed by weathering of primary bismuth and uraninite in hydrothermal quartz veins.
It is found associated with “Apatite”, atelestite, bismutoferrite, bismutite, eulytite, hechtsbergite, metatorbernite, mixite, petitjeanite, preisingerite, pucherite, retgersite.
Signifies the (PO4)-dominant composition, phospho, and structural relationship to walpurgite.
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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