Yellow green crystal aggregates of the very rare mineral ankinovichite (IMA 2002-063) from the type locality (Kara-Chagyr Mountain, Fergana, Alai Range, Osh Oblast, Kyrgyzstan) and only one of the two known localities worldwide. Ankinovichite is a nickel-zinc-aluminium vanadate. — Photo: David Hospital · CC BY-SA 4.0
Ankinovichite
Ankinovichite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula NiAl₄(V⁵⁺O₃)₂(OH)₁₂·2H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/n). It is a member of the Chalcoalumite structural group.
Key properties: Mohs hardness 2.5–3; specific gravity 2.48; Vitreous luster; optically biaxial.
IMA symbol Akv, IMA status: approved, named in 2002.
A low-temperature hydrothermal or weathering-derived mineral. As overgrowths оп alvanite in vanadium-bearing schists (Kurumsak); is also found in fractures and as cement in schist fragments within a serpentinite matrix (Mount Kara-Chagyr).
It is found associated with Alvanite, volborthite, carnotite, goethite (Kurumsak); allophone, kolovratite, volborthite, nickelalumite, metatyuyamunite, roscoelite, tangeite.
The mineral was named to honor mineralogist Ekaterina Aleksandrovna Ankinovich (1911-1991) and geologist Stepan Gerasimovich Ankinovich (1912-1985).