Formula: Cu9(AsO4)2(SO4)(OH)10.7H2O
Origin of name: for John Parnau, American collector
Crystal system: orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 14.98 Å, b = 14.22 Å, c = 6.018 Å
Colour: green to blue
Diaphaneity:
Luster:
Habit: crystals lath-like, elongated along c-axis, less than 1 mm long, in fan-like and rosette-like aggregates
Hardness: about 2
Specific gravity: 3.09
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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