Formula: MgAl2SiO5(OH)2
Origin of name: From magnesium and chloritoid
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Greenish gray to greenish black
Diaphaneity: Translucent
Luster: Pearly on cleavage
Habit: Crystals tabular, pseudohexagonal; massive, foliated, or thin scales or plates
Hardness: 6.5
Specific gravity: 3.25
Cleavage: 3; {001} perfect, {110} distinct, {010} parting
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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