Formula: KNaZrSi3O9 . 2H2O
Origin of name: The name honors Prof. George Y. Chao of Carlton University, Ottawa, Canada, for his work with Zr silicates.
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell: a = 11.836, b = 12.94, c = 6.735
Colour: Colourless to white
Diaphaneity: Transparent
Luster:
Habit: Crystals orthorhombic to 1 mm
Hardness: 5
Specific gravity: 2.70
Cleavage: None
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties:
Comments: Isostructural with gaidonnayite
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