Formula: NaAlZr(PO4)2(OH)2.H2O
Origin of name: after locality, a granite quarry near Wycheproof, northwestern Victoria, Australia.
Crystal system: Triclinic
Crystal class: 1 or 1
Twinning:
Unit cell: a = 10.962, b = 10.986, c = 12.479, α = 71.0156°, β = 77.108°, γ = 87.016°
Colour: Pale pinkish orange to pale brownish orange
Diaphaneity: Transparent
Luster: Vitreous to pearly
Habit: Fibrous grains 5 to 10 micron x several mm long forming thick aggregates
Hardness: 4 to 5
Specific gravity: 2.81 to 2.83
Cleavage: None
Tenacity: Uneven, irregular fracture
Streak: Colourless, white
Synonyms/varieties:
Comments:
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