Malachite from Minnesota, USA
USA | |
| Copper Handbook 1911 |
| Frank Karasti |
Rocks & Minerals 81:136-140 | |
Frank Karasti | |
| Rocks & Min.: 18:302-303. |
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 |
Raspberry prospect, Burntside, St. Louis County, Minnesota, USA