Magnetite from Gilpin County, Colorado, USA
USA | |
| U.S. Geological Survey Professional Paper 94 |
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. | |
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |