Copper, Pewabic Lode, Quincy Mine, Quincy Mining Company, Lake Superior Copper District, Michigan Miniature 1.7 x 4.5 x 7.5 cm $350. Online 11/19
Branching group of sharp copper crystals with rich black and red patina. Classic twinned tetrahex crystals with associated quartz. Mined c. 1900. Perfect condition. Specimen has never been acid dipped or cleaned.