Formula: Ca3Si2O7 . H2O
Origin of name: After locality; Killala Bay, Ireland
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: White to colourless
Diaphaneity: Translucent
Luster:
Habit: Crystals, complex penetration twinning forming bow-ties, to 2mm
Hardness:
Specific gravity: 2.94
Cleavage: 3; {100} perfect, {010} and {001} good
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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