Formula: Cu4(SO4)(OH)6
Origin of name: For A. Brochant de Villiers, French mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Common on {100}, contact
Unit cell: a = 12.76 Ǻ, b = 9.86 Ǻ, c = 6.03 Ǻ, β = 90.0°
Colour: Emerald-green to blackish green, pale green
Diaphaneity:
Luster: Vitreous, pearly on cleavage
Habit: Crystals short prismatic to acicular or tabular; massive, granular, drusy crusts
Hardness: 3.5 to 4
Specific gravity: 3.97
Cleavage: 1; {100} perfect
Tenacity: Conchoidal to uneven; brittle
Streak: Pale green
Synonyms/varieties: Blancherdite, kamarezite
Comments:
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