Ferberite from Jamestown Mining District, Boulder County, Colorado, USA
USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. USGS Bull 583 |