Formula: Y2Ti2SiO9
Origin of name: after locality Trimouns talc deposit, France
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: light brown
Diaphaneity: translucent or transparent
Luster: adamantine
Habit: prismatic crystals to 5 mm long
Hardness: 7
Specific gravity: 5.0
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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