Formula: Mn(OH)2
Origin of name: from Greek for fire and colour
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 3.32 Å, c = 4.74 Å
Colour: colourless, white, pale green, blue, becomes dark brown then black
Diaphaneity: becomes opaque on exposure
Luster: pearly on cleavage when fresh
Habit: crystals tabular, rhombohedral, rarely prismatic, massive, foliated, thin veinlets
Hardness: 2.5
Specific gravity: 3.25
Cleavage: 1; {0001} perfect
Tenacity: thin foliae flexible
Streak:
Synonyms/varieties:
Comments:
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