Formula: NiMn3O7 . 3H2O
Origin of name: For Ernest H. Nickel, Canadian-Australian mineralogist
Crystal system: Hexagonal
Crystal class: 3 or -3
Twinning:
Unit cell:
Colour: Almost black with red-brown cast
Diaphaneity: Opaque
Luster: Submetallic to vitreous
Habit: Thin, almost circular plates to 0.02 x 0.5 mm, as rosettes to 0.8 mm
Hardness: ~ 2
Specific gravity: 3.84
Cleavage: 1; {0001} perfect
Tenacity:
Streak: Yellow-brown
Synonyms/varieties:
Comments:
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