Borisenkoite
Borisenkoite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Cu₃[(V,As)O₄]₂.
It crystallizes in the monoclinic crystal system (space group P2_1/c). It is a member of the Lammerite-β structural group.
Key properties: Mohs hardness 4.5; specific gravity 4.69; Yellowish brown streak; Greasy to adamantine luster.
IMA symbol Bsk, IMA status: approved, named in 2015.
Forms as a sublimate at an active volcanic fumarole.
It is found associated with Sanidine, hematite, lammerite, lammerite-β, bradaczekite, zincobradaczekite, mcbirneyite, pseudolyonsite, lyonsite, starovaite, tenorite, rutile, tripuhyite.
The mineral was named to honor Russian geochemist, mineralogist, and geologist Leonid Fedorovich Borisenko (1922-2000).