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Greenland | |
| Petersen, Ole V., Secher, Karsten (1993) The Minerals of Greenland. The Mineralogical Record, 24 (2) 1-67 |
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USA (FRL) | |
- Cheyenne Mining District (St. Peters Dome Mining District)
| Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York. Cross, W., Hillebrand, W.F. (1883) On minerals of the cryolite group recently found in Colorado. American Journal of Science: 26: 271-294 (283). |
| Gross, E. B., Heinrich, E. Wm. (1966) Petrology and mineralogy of the Mount Rosa area, El Paso and Teller Counties, Colorado. II. Pegmatites. American Mineralogist, 51 (3-4) 299-323 |
| Eckel, Edwin Butt , Cobban, Robert R., Mosburg, Shirley K., Foord, Eugene E. (1997) Minerals of Colorado. Fulcrum Publishing. |
| Foord, Eugene E., Gordon, Harvey M., Soregaroli, Arthur E. (1999) The Zapot Pegmatite, Mineral County, Nevada. The Mineralogical Record, 30 (4) 277-292 |
| O'Neill, L. C. (2014). REE-Be-UF mineralization of the Round Top laccolith, Sierra Blanca Peaks, Trans-Pecos Texas (MS dissertation). |
| Richards, R.P., Kearns, L.E., Cook, W.R. (1998) Morphology of Chiolite twins from the Morefield mine, Amelia County, Virginia. The Canadian Mineralogist: 36: 1009-1016. Kearns, L.E. (1995) Alumino-fluorides from the Morefield pegmatite, Amelia County, Virginia. The Mineralogical Record: 26(6): 551-556. |
Morefield Mine, Winterham, Amelia County, Virginia, USA