Formula: Ca10(Si2O7)2(SiO4)Cl2(OH)2
Origin of name: for Rustum Roy, American chemist
Crystal system: monoclinic
Crystal class: 2/m
Twinning: lamellar
Unit cell:
Colour: colourless
Diaphaneity:
Luster:
Habit: crystals crude, tabular, to 2 mm, lamellar twinning
Hardness:
Specific gravity: 2.84
Cleavage: 3; {100}, {010} and {001} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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