Formula: (Zn,Fe,Mn)Mn3O7 . 3H2O
Origin of name: From Greek for copper and to appear
Crystal system: Triclinic
Crystal class: -3
Twinning:
Unit cell: a = 7.53 Ǻ, b = 7.53 Ǻ, c = 8.20 Ǻ, α = 90.0°, β = 117.3°, γ = 120°
Colour: Bluish to iron-black, brownish black
Diaphaneity: Opaque
Luster: Metallic
Habit: Crystals tabular, minute, or octahedral; drusy crusts; massive, dense, granular; platy; stalactitic
Hardness: 2.5
Specific gravity: 3.98
Cleavage: 1; {001} perfect
Tenacity:
Streak: Brown
Synonyms/varieties:
Comments:
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