Cordierite from
USA | |
| King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| Sears, John H. (1890). The Stratified Rocks of Essex County. (Bulletin of the Essex Institute, Vol 22.) |
| (1917) Geology of Massachusetts and Rhode Island. Bulletin Vol. 597. US Geological Survey doi:10.3133/b597 |
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Routes 11 and 3A junction roadcut, Franklin, Merrimack County, New Hampshire, USA