Formula: Cu2Al7(AsO4)4(OH)13 . 12H2O
Origin of name: From Latin caeruleus - blue
Crystal system: Triclinic
Crystal class: 1 or -1
Twinning:
Unit cell: a = 14.36 Ǻ, b = 14.69 Ǻ, c = 7.44 Ǻ, α = 96.1°, β= 93.2°, γ = 91.6°
Colour: Deep blue, turquoise blue
Diaphaneity:
Luster:
Habit: Massive, compact, clay-like; as concretions
Hardness: 5 to 6
Specific gravity: 2.70
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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