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Yvonite - Salsigne mine, Mas-Cabardès, Carcassonne, Aude, Languedoc-Roussillon, France (TYPE LOCALITY) (#:MINS9054)

Specimen richly covered with xls of blue Yvonite up to 1 mm with Geminite in association on decomposing Bismuth matrix, from the type locality of this rare specie.

Formula :
Cu(AsO₃OH)·2H₂O
System: triclinic Hardness:3½-4 Rarity:extremely rare
Strunz id:VII/C.06-35 - VII : Phosphates, Arsenates, Vanadates
Name origin: Named in honor of Klaus Yvon, professor of crystallography at the University of Geneva, Switzerland.