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Copper, Quincy Mine, Lake Superior Copper District, Houghton County, Michigan Large cabinet 9 x 15 x 20 cm $600. Online July 9


  • $ 60000

Groups of copper crystals scattered over massive copper surface with traces of amygdaloidal matrix. The surface is highly convoluted with bunches of crystals covering the surface with fine original coppery/brown patina. Displays well from several angles. Mined c. early 1900s. No faults. Dave Dinsmore Collection.