Formula: CuAl(SO4)2Cl . 14H2O
Origin of name: For discoverer J. Auber, French geologist
Crystal system: Triclinic
Crystal class: -1
Unit cell: a = 6.288 Å, b = 13.239 Å, c = 6.284 Å, a = 91.87°, b = 94.67°, g = 82.45°
Colour: Azure-blue
Diaphaneity: Transparent
Habit: Crusts of corroded grains
Hardness: 2-3
Specific gravity: 1.82
Cleavage: 1; {010} perfect
Streak: Light blue
Synonyms/varieties:
Comments:
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