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USA | |
- Quartz Creek Pegmatite Mining District
| [var. Cyrtolite] Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| [var. Cyrtolite] Meeves, H., et al (1966), Reconnaissance of beryllium-bearing pegmatite deposits in six western states, US Bur. Mines Info. Circ. 8298: 26 (Table A-1) |
- Tomichi Mining District (White Pine Mining District)
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
- White Earth Mining District (Powderhorn Mining District)
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. Theodore J. Armbrustmacher, (1981) The complex of alkaline rocks at Iron Hill, Powederhorn district, Gunnison County, Colorado. in 32nd Field Conference New Mexico Geological Society, pp. 293-296. |