Formula: CoCO3
Origin of name: from Greek for ball and from cobalt
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 4.66 Å, c = 14.96 Å
Colour: rose-red, alters to gray-brown or black
Diaphaneity:
Luster: vitreous
Habit: crystals rare, spherical masses, small, crystalline crusts
Hardness: 4
Specific gravity: 4.13
Cleavage: 1; {10-11} perfect
Tenacity:
Streak: red
Synonyms/varieties: cobaltocalcite
Comments:
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