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A rare light blue copper corrosion product that forms delicate acicular crystals. Connellite was found as a mineral in Cornwal in 1802 by Philip Rashleigh and was examined chemically by Arthur Connell in 1847. It has also been found on prehistoric bronzes.

Composition Cu19Cl4(SO4)(OH)32·3H2O

Additional Information

H. Otto 'Das Vorkommen von Conellit in Patinaschichten", Die Naturwissenschaften 50(1):16-17, 1963.

Sources Checked for Data in Record

  • External source or communication Comment: Walter A. Franke, Magda Mircea, "Plutarch's Report on the Blue Patina of Bronze Statues at Delphi: A Scientific Explanation" JAIC 44(2):103, 2005.