Wernerbaurite
Wernerbaurite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula {(NH₄)₂[Ca₂(H₂O)₁₄](H₂O)₂}{V₁₀O₂₈}.
It crystallizes in the triclinic crystal system (space group P-1). It is a member of the Pascoite structural group.
Key properties: Mohs hardness 2; specific gravity 2.352; Yellow streak; Subadamantine luster; optically biaxial.
IMA symbol Wbr, IMA status: approved, named in 2012.
Occurs as efflorescences on sandstone in the underground workings of a roll-front type uranium vanadium deposit, from the oxidation of montroseite-corvusite assemblages in a moist environment.
It is found associated with Calciodelrioite, gypsum, huemulite, hughesite, metarossite, pascoite, rossite.
The mineral was named to honor Professor Werner H. Baur (b. 1931), Geological Sciences Department, University of Illinois, Chicago, for his distinguished career in mineralogical crystallography.