Pyrolusite from Wisconsin, USA
USA | |
| Robinson, G. & G. LaBerge (2013) Minerals of the Lake Superior Iron Ranges: A. E. Seaman Mineral Museum: Michigan Technological University, 52 p. |
| Cordua, W.S. (1998) Minerals of Wisconsin. Rocks and Minerals: 73(6): 378-399. |
| Heyl, A., A. F. Agnew, E. J. Lyons & C.H. Behre Jr. (1959), The geology of Upper Mississippi Valley Zinc-Lead District: U.S. Geological Survey Professional Paper 309: 231-232 |
| Cordua, W. (1998) Minerals of Wisconsin: Rocks and Minerals: 73 (6): 378 - 399 |
Montreal Mine, Montreal, Gogebic Range, Iron County, Wisconsin, USA