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