Formula: Cu2(CO3)(OH)2
Origin of name: From Greek for mallow
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Universal on {100} about [201] axis, often penetration, occasionally polysynthetic
Unit cell: a = 9.50 Å, b = 11.97 Å, c = 3.24 Å, β = 98.8°
Colour: Bright green to dark or blackish green
Diaphaneity:
Luster: Vitreous to adamantine
Habit: Crystals acicular or short to long prismatic, wedge-shaped terminations, small; massive; compact crusts; botryoidal
Hardness: 3.5 to 4
Specific gravity: 4.05
Cleavage: 2; {201} perfect, {010} fair
Tenacity: Subconchoidal to uneven; brittle
Streak: Pale green
Synonyms/varieties:
Comments: Lustre of fibres silky or velvety
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