Formula: BaAl2(CO3)2(OH)4 . H2O
Origin of name: For John Dresser, Canadian geologist
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: White
Diaphaneity: Transparent
Luster: Vitreous to silky
Habit: Tapering fibres, in spherical aggregates
Hardness: 2.5 to 3
Specific gravity: 2.96
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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