Copper, South Cliff Mine, Michigan. FOV approx. 3 mm. Steve Stuart photo

Fractal copper crystals from the South Cliff Mine, Keweenaw County, Michigan. Gift from George Balogh at the 2015 Rochester Mineralogical Symposium. He collected it in 2014. Processed with Zerene Stacker pyramid algorithm (24 slices) and Picasa 3.9 for color balance, sharpening and cropping. About 3 mm FOV.