Formula: Mg2(Al,Fe)3Si3AlO10(OH)8
Origin of name: for T. Sudo, Japanese mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: whitish
Diaphaneity: translucent
Luster:
Habit: massive, fine-grained
Hardness:
Specific gravity: 2.56 to 2.65
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: member of the chlorite group
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