Chrysoberyl from
USA | |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
Rocks & Min.:57:53-54. | |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. Hanley, J.B., Heinrich, E.W., Page, L.R. (1950) Pegmatite investigations in Colorado, Wyoming, and Utah, 1942-1944. Professional Paper 227. US Geological Survey doi:10.3133/pp227 |
Bull Elk Beryl Crystal #1 Mine, Crystal Mountain Pegmatite Mining District, Larimer County, Colorado, USA