Formula: Na2Ti(Si,Al)3O9.nH2O
Origin of name: from Russian for rosy radiance of the sky at dawn
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 23.91 Å, b = 7.23 Å, c = 14.24 Å
Colour: Pink, rose-red
Diaphaneity: Transparent
Luster: Vitreous
Habit: Prismatic, to 2 mm, in intergrowths, polycrystalline plates to 10 cm
Hardness: 3 to 4
Specific gravity: 2.36
Cleavage: 3; {010} and {001} perfect, {110} less perfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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