Cuprite from selected localities.
USA | |
| Rosemeyer, T. (2001) The Copper-Bearing Conglomerate Lodes of the Michigan Copper Country. Rocks & Minerals: 76(3): 156-188. |
| Mineralogy of Michigan (2004) Heinrich & Robinson |
Morris Jr., T. (1983) Michigan Mineralogy: A Locality Index. Rocks & Minerals: 58(3): 109. | |
| Larry Maltby, Obvious red crystals on copper; |
St. Louis Mine Exploration, Schoolcraft Township, Houghton County, Michigan, USA