Here we have a richly-colored blue water-soluble cooper sulfate named Chalcanthite. That was grown in a laboratory in Poland. Chalcanthite is a secondary copper mineral and crystals do occur naturally in regions where there is a very dry climate and where there are copper deposits. ‘Natural’ occurring Chalcanthite crystals usually form as very small crystals or as bluish crusts of Chalcanthite or as solid ‘stalactites’ of chalcanthite. Under laboratory conditions Chalcanthite forms as surreal ‘electric’ blue colored crystals that are well-formed and sharp and very lustrous. This specimen is a very colorful and aesthetic display specimen. Another amazing feature of this mineral is that it is poisonous when we eat or aspire.