Formula: Ca5(SiO4)2(CO3)
Origin of name: from Greek para = similar and spurrite
Crystal system: monoclinic
Crystal class: 2/m
Twinning: polysynthetic
Unit cell:
Colour: colourless in thin section
Diaphaneity:
Luster:
Habit: crystals to 2 cm, polysynthetic twinning
Hardness:
Specific gravity: 3.0
Cleavage: 1; {001} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with spurrite
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