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USA | |
| King, V., 2009, Maine Feldspar, Families, and Feuds. |
| Falster, Alexander U., Simmons, William B., Webber, Karen L., Dallaire, Donald A., Nizamoff, James W., Sprague, Raymond A. (2019) The Emmons Pegmatite, Greenwood, Oxford County, Maine. Rocks & Minerals, 94 (6) 498-519 doi:10.1080/00357529.2019.1641021 King, Van (n.d.) Personal communcation. |
| Dionne, Dick & Birtic, Cal & Jacobson, Mark. (2014) The Perry petalite prospect of Peru, Maine.. Mineral News. 30. 6,8,9,11,13. |
| King, Van (n.d.) Personal communcation. |
| Tim Blake and Scott Soucey specimens |
Black Mountain Quarry, Rumford, Oxford County, Maine, USA