Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2
Origin of name: From Greek glaukos = bluish green
Crystal system: Monoclinic
Crystal class: m or 2/m
Twinning:
Unit cell:
Colour: Dull green, yellowish green, blue-green
Diaphaneity: Translucent, nearly opaque
Luster: Dull, glistening
Habit: Crystals lath-like, microscopic; in aggregates of irregular platelets
Hardness: 2
Specific gravity: 2.4 to 2.95
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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