Formula: Cu5(PO4)2(OH)4
Origin of name: from Greek pseudo = false and malachite
Crystal system: monoclinic
Crystal class: 2/m
Twinning: on {100}
Unit cell: a = 4.48 Å, b = 5.75 Å, c = 17.05 Å, b = 91.1°
Colour: dark green to blackish green, fibrous material bluish green to green
Diaphaneity:
Luster: vitreous
Habit: crystals short prismatic, in subparallel aggregates, reniform, botryoidal, massive, with radial structure, concentric
Hardness: 4.5 to 5
Specific gravity: 4.30 to 4.35
Cleavage: 1; {100} perfect, difficult
Tenacity: splintery
Streak:
Synonyms/varieties: tagilite
Comments: trimorphous with ludjibaite and reichenbachite
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