Formula: Na15(SO4)5F4Cl
Origin of name: For William Gale, American chemist
Crystal system: Hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: White
Diaphaneity:
Luster:
Habit: Crystals hexagonal, barrel-shaped, in small nodular aggregates
Hardness:
Specific gravity: 2.61
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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