Formula: Cu2(OH)3Cl
Origin of name: from Greek para = similar and atacamite
Crystal system: hexagonal
Crystal class: -3
Twinning: common on {10-11} may be polysynthetic
Unit cell: a = 11.83 Å, c = 6.17 Å
Colour: green to greenish black
Diaphaneity:
Luster: vitreous, earthy to dull
Habit: crystals rhombohedral, twinned, massive, granular, powdery incrustations
Hardness: 3
Specific gravity: 3.74
Cleavage: 1; {10-11} good
Tenacity: conchoidal to uneven
Streak:
Synonyms/varieties: anarakite (Zn-rich variety)
Comments: trimorphous with atacamite and botallackite
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