Marcasite from Central City Mining District (Central Mining District), Gilpin County, Colorado, USA
USA | |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| U.S. Geological Survey Professional Paper 371 |
| U.S. Geological Survey Professional Paper 371 |