Formula: NaAl(CO3)(OH)2
Origin of name: For John Dawson, Canadian geologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 6.77 Å, b = 10.40 Å, c = 5.58 Å
Colour: Colourless, white
Diaphaneity:
Luster: Vitreous, aggregates silky
Habit: Crystals acicular to blade-like; radial groups and incrustations
Hardness: 3
Specific gravity: 2.44
Cleavage: 1; {110} perfect
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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