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USA | |
| [Opal-A var. Opal-AN] Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
| Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
| Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
| [Opal-A var. Opal-AN] Rick Dalrymple |
- Roosevelt Hot Springs Mining District
| Petersen, C.A. (1975) Geology and geothermal potential of the Roosevelt Hot Springs area, Beaver County, Utah. Thesis for Master of Science, University of Utah: 49. |
| Moore, J. N. & Samberg, S. M. (1978) Geology of Roosevelt Hot Springs KGRA, Beaver County, Utah. Earth Science Laboratory, University of Utah Research Institute. Nielson, D. L. Sibbett, B. S. McKinney, D. B. Hulen, J. B. |
| [Opal-AN var. Hyalite] Nassau K., Wood D.L. (1968) An examination of red beryl from Utah. The American Mineralogist, 53: 801-806. |
- San Francisco Mining District
| Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
| Bullock, Kenneth C. (1981) Minerals and mineral localities of Utah. Bulletin 117. Utah Geological and Mineral Survey |
Hyalite occurrence, Milford, Beaver County, Utah, USA