|
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. 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 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. Am Min 50:1179-1212 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |