Formula: (Mn,Mg)13(Al,Fe)4Sb2Si2O28
Origin of name: From Greek for mirror
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Black
Diaphaneity: Opaque
Luster: Metallic, brilliant
Habit: Crystals tabular, somewhat elongate, or equant; minute grains; masses to 1 cm
Hardness: 5.5
Specific gravity: 4.56
Cleavage: 1; {001} perfect, micaceous
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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