Formula: Ca4Si2O7(F,OH)2
Origin of name: From Latin cuspis - spear
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless, white, greenish grey, pale rose-red, pinkish red
Diaphaneity: Transparent to translucent
Luster: Vitreous
Habit: Crystals spear-shaped, small; massive, fine granular
Hardness: 5 to 6
Specific gravity: 2.8 to 2.99
Cleavage: 2; {001} and {110} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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