Formula: Zn2(AsO4)(OH)
Origin of name: from Greek para = similar and adamite
Crystal system: triclinic
Crystal class: -1
Twinning:
Unit cell: a = 5.83 Å, b = 6.71 Å, c = 5.65 Å, a = 104.7°, b = 92.3°, g = 76.8°
Colour: pale yellow
Diaphaneity:
Luster: vitreous
Habit: crystals equant, somewhat rounded, striated, to 5 mm, in sheaf-like aggregates
Hardness: 3.5
Specific gravity: 4.55
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with adamite
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