<---- FOV 4mm ---->

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, if Se is replaced by Te, becomes Teineite and both look very much alike in color.