Formula: FeAl2(PO4)2(OH)2 . 8H2O
Origin of name: From Greek for lower (hydration), but this is a higher hydrate
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 10.25 Å, b = 9.59 Å, c = 6.96 Å, β = 97.9°
Colour: Colourless, white, pale green
Diaphaneity:
Luster: Vitreous
Habit: Crystals long prismatic to acicular; subparallel to radial aggregates
Hardness: 3
Specific gravity: 2.345
Cleavage: None
Tenacity: Brittle
Streak:
Synonyms/varieties:
Comments: Dimorphous with paravauxite
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