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USA | |
| Jim G. Ferguson (1922) Minerals in Arkansas |
| Shepard, Charles U. (1841): On two Decomposed Varieties of Iolite. American Journal of Science: series 1, 41: 354-358. |
| Williams, Horace S. (1899): Letter to Miss Eveline Brainerd of Haddam, February 18, 1899. Brainerd Public Library, Haddam, Connecticut. |
| Foye, Wilbur G. (1922) Mineral localities in the vicinity of Middletown, Connecticut. American Mineralogist, 7 (1) 4-12 Davis, James W. (1901): The Minerals of Haddam, Conn. Mineral Collector, v. 8, no. 4, pp. 50-54, and no. 5, pp. 65-70. Shepard, Charles U. (1841): On two Decomposed Varieties of Iolite. American Journal of Science: series 1, 41: 354-358. |
| Ted Johnson collection |
| www.pnwfm.org (2006) http://www.pnwfm.org/newsletters/PNWFM_newsletter_0409.pdf |
Timms Hill, Haddam, Middlesex County, Connecticut, USA