Opal from selected localities.
USA | |
| |
| Museum of Natural History, Roger Williams Park, Providence, R.I. G3834 6070 |
Miller, C.E. (1972) Minerals of Rhode Island. Department of Geology, University of Rhode Island, 83 pages. | |
AmMin 22:279 | |
| Rocks & Minerals (1986): 61: 286-289 |