Copper in Basalt, Lake Superior Copper District, attr: Petherick Mine, Copper Falls Complex, Keweenaw County, Michigan Medium cabinet 9 x 9 x 15 cm $75. Online 6/6
Veinlet of copper, 9.7 cm long, protruding from a mass of basalt. Upon close examination the copper is actually crystallized in a tight compacted vein breccia rich in prehnite. Attractive matrix copper specimens suitable for display are always nice to find and this one is uncommonly aesthetic. Collected 1994 from the lower rock pile at Copper Falls. No faults.