Formula: CaCu(OH)VO4
Origin of name: after locality Tange gorge, Fergana Valley, Kyrgystan
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 7.45, b = 9.26, c = 5.91
Colour: Green, dark green, yellowish green, yellow
Diaphaneity: Transparent to subtranslucent
Luster: Vitreous, pearly on cleavage
Habit: Granular, rare crystals are short prismatic, with acute terminations, typically in scaly rosettes and aggregates, botryoidal to spheroidal, fibrous, crusts
Hardness: 3.5
Specific gravity: 3.75
Cleavage: 2; {010} perfect, {001} good
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments: originally considered to be calciovolborthite
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