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USA | |
| Januzzi, Ron E., Seaman, David M. (1976) Mineral Localities of Connecticut and Southeastern New York State and Pegmatite Minerals of the World. The Mineralogical Press, Danbury, Connecticut, USA. |
| Moritz, Harold (n.d.) Personal Communication. |
- Torrington (Wolcottville)
| Shepard, Charles U. (1837), A Report on the Geological Survey of Connecticut. Hamlen, New Haven. |
| Samuel Robinson (1825) A Catalogue of American Minerals, with their localities. Boston |
Barkhamsted, Litchfield County, Connecticut, USA