A rare hydrated copper arsenate which occurs as turquoise-blue, vitreous, triclinic (elongated ) crystals in radiated spherules and aggregates at the type locality: Salsigne mine, Salsigne, Mas-Cabardes, Carcassonne, Aude, Languedoc-Roussillon, France. This deposit is polymetallic vein type with stratabound mineralization of gold, copper, and zinc. Yvonite was characterized in 1995 and named after Professor Klaus Yvan of the Crystallography Department, University of Geneva, Switzerland. Other notable localities include: Cap Garonne mine, Le Paradet, Var, Parvence-Alpes Cote d' Azur, France.
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