Formula: (Na2,Ca)Al2Si4O12 . 8H2O
Origin of name: For B. Faujas de St. Fond, French geologist
Crystal system: Cubic
Crystal class: 4/m -3 2/m
Twinning: On {111}, contact or penetration
Unit cell: a = 24.65 Ǻ
Colour: Colourless, white
Diaphaneity:
Luster: Vitreous
Habit: Crystals octahedral
Hardness: 5
Specific gravity: 1.92
Cleavage: 1; {111} distinct
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments:
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