Dictionary  blue' vit'riolChem., Mineral. a salt, copper sulfate, CuSO4·5H2O, occurring naturally as large transparent, deep-blue triclinic crystals, appearing in its anhydrous state as a white powder: used chiefly as a mordant, insecticide, fungicide, and in engraving. Also called blue copperas, chalcanthite, cupric sulfate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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