Formula: PbCl(OH)
Origin of name: from Greek para = similar and laurionite
Crystal system: monoclinic
Crystal class: 2/m
Twinning: very common on {100} contact
Unit cell: a = 8.31 Å, b = 3.98 Å, c = 7.19 Å, b = 117.2°
Colour: colourless, white, violet or green
Diaphaneity: transparent
Luster: subadamantine
Habit:
Hardness: 1
Specific gravity: 6.15
Cleavage: 1;[ {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments: dimorphous with laurionite
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