Formula: CaAl2(F,OH)8
Origin of name: from Greek for mask
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless, white, gray
Diaphaneity: transparent to translucent
Luster: vitreous
Habit: crystals tabular, minute, embedded blades or bundles, massive, fine granular to powdery
Hardness: 4.5
Specific gravity: 2.89
Cleavage: 1; {111} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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