Formula: (K,Na)2(Mn,Al,Mg)8(Si,Al)12O29(OH)7 . 8-9H2O
Origin of name: Form Greek ganos = bright and phyllon = leaf
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Brown to brownish yellow
Diaphaneity: Translucent
Luster: Vitreous, brilliant
Habit: Crystals short prismatic, or tabular; foliated or micaceous; rosettes
Hardness: 4 to 4.5
Specific gravity: 2.84 to 2.878
Cleavage: 1; {001} perfect, easy
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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