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USA | |
| Muntyan, Barbara, Muntyan, John (1985) Minerals of the Pikes Peak Granite [Colorado]. The Mineralogical Record, 16 (3) 217-230 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
Crystal Peak, Teller County, Colorado, USA