Formula: Pb(Ca,Mn)2Si3O9
Origin of name: From Greek for pearl and tablet
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Pearly on cleavage
Habit: Lamellar masses of thin plates
Hardness: 2.5 to 3
Specific gravity: 4.33
Cleavage: 3; {010} perfect, {100} good, {001} fair
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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