Chalcopyrite from Richland County, Wisconsin, USA
USA | |
| Cordua, W. (1998) Minerals of Wisconsin: Rocks and Minerals: 73 (6): 378 - 399 |
Heyl, A. & W. West, 1982, Outlying mineral occurrences related to the Upper Mississippi Valley Mineral District, Wisconsin, Iowa, Illinois, and Minnesota, Economic Geology: 77(8):1803-1817. |