Opal-AN from selected localities.
USA | |
| Mike Polletta Observation |
| Brace, John P. (1823), Miscellaneous Localities of Minerals. American Journal of Science: s.1, 6: 250-1.; Shepard, Charles U. (1837), A Report on the Geological Survey of Connecticut. Hamlen, New Haven. |
| Ryerson, Kathleen H. (1972) Rockhouns Guide to Connecticut |
Nonnewaug River Industrial Park, Woodbury, Litchfield County, Connecticut, USA