Formula: Cu2(NO3)(OH)3
Origin of name: For Charles Gerhardt, American chemist
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 5.592, b = 6.075, c = 13.812
Colour: Emerald-green to dark green
Diaphaneity: Transparent
Luster: Vitreous
Habit: Crystals tabular, thick
Hardness: 2
Specific gravity: 3.40 to 3.43
Cleavage: 2; {001} perfect, {100} good
Tenacity:
Streak: Light green
Synonyms/varieties:
Comments:
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