Formula: Zn3(PO4)2.4H2O
Origin of name: from Greek para = similar and hopeite
Crystal system: triclinic
Crystal class: -1
Twinning: common on {100} polysynthetic
Unit cell: a = 5.77 Å, b = 7.54 Å, c = 5.28 Å, a = 93.4°, b = 91.2°, g = 91.4°
Colour: colourless
Diaphaneity:
Luster: vitreous, pearly on cleavage
Habit: crystals tabular, elongated along c-axis, in radial groups or subparallel aggregates
Hardness: 3.5
Specific gravity: 3.31
Cleavage: 1; {010} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with hopeite
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