Donowensite
Donowensite is an IMA-recognized mineral species in the vanadate class, with the chemical formula Ca(H₂O)₃Fe³⁺₂(V₂O₇)₂.
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 3; specific gravity 2.97; Orange streak; Subadamantine luster; optically biaxial.
IMA symbol Dnw, IMA status: approved, named in 2021.
A secondary mineral found in brown concretionary masses in potassic fenitized, feldspathoidal syenite.
It is found associated with Mikehowardite, bokite, and an indistinct smectite-group mineral.
The mineral was named to honor American geologist and mineralogist Don R. Owens (1937-2015). Owens had a distinguished career in vanadium exploration with Union Carbide.
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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