A rare blue green copper corrosion product that forms delicate acicular crystals. Connellite was found as a mineral in Cornwall in 1802 by Philip Rashleigh and was examined chemically by Arthur Connell in 1847. It has also been found on prehistoric bronzes.
Physical and Chemical Properties
- Composition = Cu19Cl4SO4)(OH)32 3H2O
- Blue green to light blue fibrous to acicular needles
- Lust = vitreous to glass
- Streak = light blue green
- Hardness = 3
- Density = 3.4
Resources and Citations
- H. Otto 'Das Vorkommen von Conellit in Patinaschichten", Die Naturwissenschaften 50(1):16-17, 1963.
- 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.
- Wikipedia: http://en.wikipedia.org/wiki/Connellite (accessed Nov. 30, 2005)
- Webmineral: Connellite