Wrightite
Wrightite is an IMA-recognized mineral species in the arsenate class, with the chemical formula K₂Al₂O(AsO₄)₂.
It crystallizes in the orthorhombic crystal system (space group Pnma).
Key properties: specific gravity 3.5; White streak; Vitreous luster; optically biaxial.
IMA symbol Wgh, IMA status: approved, named in 2016.
Occurs as sublimates on basaltic scoria near a volcanic fumarole vent (500-6000 flC.).
It is found associated with Sylvite, ponomarevite, piypite, dolerophanite, euchlorine, lammerite, johillerite, urusovite, bradaczekite, filatovite, hatertite, hematite, ozerovaite.
The mineral was named to honor Adrian Carl Wright (b. 1944), Emeritus Professor, University of Reading, UK, a well-known expert in structural studies of glass-forming systems.