Formula: Na2(Nb,Ti)2(Si2O7)2(O,F)4 . nH2O
Origin of name: Form Greek for letter
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: White, yellowish white, gray, light brown
Diaphaneity: Translucent
Luster: Pearly
Habit: Crystals rectangular plates; thin lamellar aggregates
Hardness: 1 to 1.5
Specific gravity: 2.65 to 2.89
Cleavage: 2; {001} perfect, {110} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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