Formula: Cu7S4
Origin of name: After locality; Ani mine, Akita, Japan
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Unit cell: a = 7.89 Å, b = 7.84 Å, c = 11.01 Å
Colour: Bluish grey
Diaphaneity: Opaque
Habit: Crystals prismatic or platy
Hardness: about 3
Specific gravity: 5.68 (calculated)
Cleavage: None
Streak: Black
Synonyms/varieties: none
Comments: In drusy quartz veins
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