Zubkovaite
Zubkovaite is an IMA-recognized mineral species in the arsenate class, with the chemical formula Ca₃Cu₃(AsO₄)₄.
It crystallizes in the monoclinic crystal system (space group C2).
Key properties: Mohs hardness 3; specific gravity 4.161; Light blue streak; Vitreous luster; optically biaxial.
IMA symbol Zub, IMA status: approved, named in 2018.
A sublimate or, more likely, crystallized by the interaction between fumarolic gas and adjacent basalt scoria.
It is found associated with Anhydrite, svabite, hematite, johillerite, tilasite, fluorophlogopite, sanidine, aphthitalite. Distribution From the Arsenatnaya fumarole.
The mineral was named to honor Russian crystallographer and crystal chemist Natalia Vital’evna Zubkova (b. 1976), Associate Professor of Geology, Moscow State University.