Killalaite

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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