Formula: Pb9Ca5MnSi9O33
Origin of name: From Greek ganos = bright
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell:
Colour: Colourless, white to gray
Diaphaneity: Transparent to translucent
Luster: Vitreous to pearly
Habit: Crystals prismatic or tabular; massive, granular or curved plates
Hardness: 3
Specific gravity: 5.74
Cleavage: 1; Prismatic
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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