Formula: Ba(Ti,V,Cr)8O16
Origin of name: Locality; Ankang Co, Shaanxi Province, China
Crystal system: Tetragonal
Crystal class: 4/m
Unit cell: a = 10.139 Å, c = 2.961 Å
Colour: Black
Diaphaneity: Opaque
Luster: Vitreous to adamantine
Habit: Euhedral to subhedral tetragonal prismatic crystals to 0.5 x 0.5 x 1 mm
Hardness: 6.5
Specific gravity: 4.44
Cleavage: Interrupted perpendicular to elongation, possibly a parting
Streak: Greyish black
Synonyms/varieties:
Comments: Member of the cryptomelane group. Found in a quartz vein.
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