Formula: (Ca,Cu)Al6(PO4)4(OH)8 . 4-5H2O
Origin of name: From Latin coeruleus = blue lactis = milk, for its typical colour.
Unit cell: a = 7.529, b = 9.951, c = 7.782, α = 112.51°, β = 116.54°, γ = 68.57°
Colour: Milk white to light blue
Diaphaneity: Semitransparent
Luster: Vitreous, waxy
Habit: Fibrous or minutely crystalline crusts; botryoidal aggregates; veinlets, cryptocrystalline
Hardness: 5
Specific gravity: 2.57 to 2.67
Cleavage: None
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties:
Comments:
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