Formula: ZnMn2O4
Origin of name: From Greek for companion
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning: Rare on {112}, fivelings
Unit cell: a = 5.720 Ǻ, c = 9.245 Ǻ
Colour: Brownish-black, black
Diaphaneity:
Luster: Submetallic
Habit: Crystals octahedral; massive
Hardness: 6
Specific gravity: 5.18
Cleavage: 1; {001} indistinct
Tenacity: Uneven; brittle
Streak: Dark brown
Synonyms/varieties:
Comments:
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