Formula: FeFe2(PO4)2(OH)2
Origin of name: For Aliuzio Barbosa, Brazilian geologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 7.31 Ǻ, b = 7.49 Ǻ, c = 7.52 Ǻ, β = 92.0°
Colour: Dark blue-green, greenish blue to almost black
Diaphaneity:
Luster: Vitreous to dull and earthy
Habit: Crystals small short prismatic; massive; powdery crusts
Hardness: 5.5 to 6
Specific gravity: 3.60
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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