Formula: Ca6Si3O11(OH)2
Origin of name: For Della M. Roy, American materials scientist
Crystal system: Monoclinic
Crystal class:
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals prismatic, elongated
Hardness:
Specific gravity: 2.94
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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