Formula: MgAl2(PO4)2(OH)2 . 8H2O
Origin of name: For S. Gordon, American mineralogist
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 5.24 Ǻ, b = 10.49 Ǻ, c = 6.96 Ǻ, α = 107.4°, β = 111.1°, γ = 72.4°
Colour: Colourless, smoky white, pale pink, pale green
Diaphaneity:
Luster: Vitreous, pearly on {100}
Habit: Crystals prismatic to platy, minute, vertically striated, rare; sheaf-like aggregates
Hardness: 3.5
Specific gravity: 2.22
Cleavage: 3; {010} perfect, {100} fair, {001} poor
Tenacity: Conchoidal; brittle
Streak: White
Synonyms/varieties:
Comments:
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