Formula: Ca2(Mg,Fe)(PO4)2 . 2H2O
Origin of name: For William Collins, Canadian geologist
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 5.73 Ǻ, b = 6.78 Ǻ, c = 5.44 Ǻ, α = 97.3°, β = 108.6°, γ = 107.3°
Colour: Colourless, white, light brown
Diaphaneity:
Luster: Vitreous to silky
Habit: Crystals short prismatic to thin tabular, in sheaf-like aggregates; thick crusts with radial-fibrous structure
Hardness: 3.5
Specific gravity: 2.93
Cleavage: 2; {001} and {010} perfect
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments:
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