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USA | |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
- Lake George (Badger Flats) Area
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Winchell, Alexander Newton (1914) Mining districts of the Dillon quadrangle, Montana, and adjacent areas. Bulletin Vol. 574. US Geological Survey doi:10.3133/b574 |
| Personal collection and XRD analysis by Fred E Davis |
| Seaman, David (1976) Pegmatite Minerals of the World. In Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Connecticut. Seaman, David M. (1956) Pegmatite Minerals of the United States. Rocks & Minerals, 31 (5) 227-233 doi:10.1080/00357529.1956.11767672 |
| New Mexico Bureau of Mines and Mineral Resources, Mineral Museum no. 13134 |
Ruggles Mine, Grafton, Grafton County, New Hampshire, USA