Formula: (Ni,Zn)Al4[(OH)12|V2O6]
· 2.5H2O
Origin of name: Honouring Ekaterina Aleksandrovna Ankinovich (1911-1991) and Stepana Gerasimovicha Ankinovich (1912-1985) for their work on Asian vanadium deposits
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common
Unit cell: a = 17.81 , b = 5.123 Å, c = 8.866 Å, β = 92.14°
Colour: Colourless to pale bluish green
Diaphaneity: Transparent
Luster: Vitreous
Habit: Elongated tabular crystals with a six-sided shape
Hardness: 2.5 - 3
Specific gravity:
Cleavage: Perfect on (010)
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments: Found in vanadium-bearing slates, IMA approved 2002
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