rockon-ro:CHALCANTHITE (Copper Sulfate) crystals that were grown in a laboratory by allowing a sat
rockon-ro: CHALCANTHITE (Copper Sulfate) crystals that were grown in a laboratory by allowing a saturated solution of copper sulfate to slowly evaporate. The beautiful electric blue colour is typical of laboratory grown chalcanthite crystals. Although the crystals are not natural, they are worth the purchase and are stunning to view with a binocular microscope. Upper photo wase taken at 15X with a microscope. -- source link