Formula: (Fe,Al)25(PO4)17O6(OH)12 . 75H2O
Origin of name: From Greek for bad guest, as phosphorus is a bad guest in iron
Crystal class: 6/m
Unit cell: a = 27.6 Ǻ, c = 10.4 Ǻ
Colour: golden yellow, yellow, brownish yellow, reddish yellow
Diaphaneity:
Habit: Crystals minute, acicular, as radiating tufted aggregates, crusts
Hardness: 3 to 4
Specific gravity: 2.26
Cleavage: None
Synonyms/varieties:
Comments:
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