Copper, Central Mine, Central Mining Company, Lake Superior Copper District, Keweenaw County, Michigan Small cabinet 3.2 x 5.7 x 8 cm $3500. Online 4/29
Grape-like cluster of sharp copper crystals with no point of attachment. The Central Mine was one of the great fissure mines of the district and outlasted many by paying dividends and staying open until late in the 1890s. Choice specimen from the collection of Paul Labonte.