Formula: BaCu3(VO4)2(OH)2
Origin of name: for L. Vesignie (1870-1954), French mineral collector, President of the Mineralogical Society of France.
Crystal system: Monoclinic
Crystal class: 2/m
Twinning: Polysynthetic common, on {001}
Unit cell: a = 10.27, b = 5.911, c = 7.711, β = 116.42°
Colour: Yellow-green to dark olive-green
Diaphaneity: Semitransparent
Luster: Vitreous
Habit: Polysynthetic twins with pseudohexagonal outline, to 0.5 mm, lamellar aggregates
Hardness: 3.5 to 4
Specific gravity: 4.05
Cleavage: 1; {001} perfect, {110} imperfect
Tenacity: Uneven fracture
Streak: Light green
Synonyms/varieties:
Comments:
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