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USA | |
| A.E. Foote www.mindat.org (n.d.) https://www.mindat.org/photo-1065483.html. |
| West, D. P., Bradley, D., & Coish, R. (2016). The Litchfield pluton in south-central Maine: Carboniferous alkalic magmatism in northern New England, USA. Atlantic Geology, 52, 169-187. |
| King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| Anthony, John W., Bideaux, Richard A., Bladh, Kenneth W., Nichols, Monte C. - Eds. (2016) Handbook of Mineralogy. https://www.handbookofmineralogy.org/ |
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| Woolley, A. R. (1987) Alkaline Rocks and Carbonatites of the World. Part 1: North and South America. |
| Wellman, Thomas R. (1971) Feldspathoidal Rocks of the Red Hill Igneous Complex, New Hampshire, Journal of Geology v 79, No. 5 (Sep., 1971), pp. 621-627 |
Dennis Hill locality, Litchfield, Kennebec County, Maine, USA