Formula: Fe3Al4(PO4)4(OH)6 . 2H2O
Origin of name: For Donald H. Gorman, Canadian mineralogist
Crystal system: Triclinic
Crystal class: 1 or -1
Twinning: on {001} about [010] axis
Unit cell: a = 11.79 Ǻ, b = 5.11 Ǻ, c = 13.61 Ǻ, α = 90.8°, β = 99°, γ = 90.1°
Colour: Blue-green
Diaphaneity:
Luster:
Habit: Crystals elongated or blade-like, small, radial aggregates
Hardness: 4.5
Specific gravity: 3.13
Cleavage: 1; {001} poor
Tenacity:
Streak:
Synonyms/varieties:
Comments: Series with souzalite
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