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Yvonite

Type Locality
Salsigne mine, Salsigne, Mas-Cabardès, Carcassonne, Aude, Languedoc-Roussillon, France
Mineral Data
Cu(HAsO4)·2H2O
Strunz: 
8.CB.25
Physical Properties
Crystal System: 
Triclinic
Hardness: 
3.5 - 4.0