Formula: LiAlSi4O10
Origin of name: from Greek petalo = petal
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless, white, gray, yellow
Diaphaneity: transparent to translucent
Luster: vitreous to pearly
Habit: crystals euhedral, small, rare, massive, cleavable
Hardness: 6 to 6.5
Specific gravity: 2.3 to 2.5
Cleavage: 2; {001} perfect, {201} distinct
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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