Formula: Cu2(AsO4)(OH) . 3H2O
Origin of name: From Greek for beautiful colour
Crystal system: Orthorhombic
Crystal class: 222
Twinning:
Unit cell: a = 10.07 Ǻ, b = 10.52 Ǻ, c = 6.12 Ǻ
Colour: Bright emerald-green
Diaphaneity:
Luster: Vitreous
Habit: Crystals short prismatic to equant; thick tabular
Hardness: 3.5 to 4
Specific gravity: 3.44
Cleavage: 2; {101} and {110} indistinct
Tenacity: Subconchoidal to uneven; brittle
Streak:
Synonyms/varieties:
Comments:
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