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Chalcomenite
CuSeO₃2H₂O
Baccu Locci Mine, Villaputzu, Cagliari Province, Sardegna, Italy

A cluster with well-represented (partly neon)blue xls of Calcomenite, the ultra rare selenite for which Baccu Locci is known for having been the source of the best specimens in the world. Calcomenite is similar to Teineite in chemical formula with the only difference being Se/Te, and both look very much alike in color.