Snow-white crystal crusts of nishanbaevite crystals with bright green euchlorine, bluish �ne-grained lammerite, iron-black hematite and colourless, transparent langbeinite overgrowing reddish-brown basalt scoria altered by fumarolic gas. FOV width: 4.4 mm. Photo: I.V. Pekov & A.V. Kasatkin — Photo: I.V. Pekov & A.V. Kasatkin · CC BY 4.0
Nishanbaevite
Nishanbaevite is an IMA-recognized mineral species in the arsenate class, with the chemical formula KAl₂O(AsO₄)(SO₄).
It crystallizes in the orthorhombic crystal system (space group Pbcm).
Key properties: specific gravity 3.011; White streak; Vitreous luster; optically biaxial.
IMA symbol Nbv, IMA status: approved, named in 2019.
A sublimates at an active volcanic fumarole.
It is found associated with Alumoklyuchevskite, langbeinite, urusovite, lammerite, lammerite-β, ericlaxmanite, kozyrevskite, hematite. Distribution From the Arsenatnaya fumarole.
The mineral was named to honor Russian mineralogist Tursun Prnazorovich Nishanbaev (1955-2017), former Head of the Natural History Museum, Ilmen Natural Reserve, Miass, Russia.