Cuprite from St. Louis County, Minnesota, USA
USA | |
| [var. Chalcotrichite] Frank Karasti |
| Eby, J. H. and Berkey, C. P. (1897) The Occurrence of Copper Minerals in Hematite Ore, Montana Mine, Soudan Minnesota. Year Book of the Society of Engineers, University of Minnesota 108-117 |
Knife River, St. Louis County, Minnesota, USA