|
USA | |
| King, V. (ed), 2009, Maine Feldspar, Families, and Feuds. |
| [Opal-A var. Opal-AN] Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey |
| [Opal-A var. Opal-AN] www.geocities.com/~stuarts1031/fluorescent4.html |
| [Opal-A var. Opal-AN] Thompson, Woodrow B., Joyner, Ronald L., Woodman, Raymond G., King, Vandall T. (1998) Bulletin (41), A Collector's Guide to Maine Mineral Localities (3rd ed.) Maine Geological Survey |
| [Opal-AN var. Hyalite] 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 |
| [Opal-A var. Opal-AN] Moritz, Harold (n.d.) Personal Communication. |
| [Opal-A var. Opal-AN] King, Vandall T. (2000) Mineralogy of Maine Vol. 2 - Mining History, Gems, and Geology. Maine Geological Survey. King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| Cameron, Eugene N., , (1954) Pegmatite investigations, 1942-45, in New England. Professional Paper 255. US Geological Survey doi:10.3133/pp255 Cameron, Eugene N. |
| [Opal-A var. Opal-AN] King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. King, V, 2006, Minerals of Halls Ridge and Plumbago-Puzzle Mountain, Newry, Oxford County, Maine, Mineral News, v. 22 (6), p. 1-3. |
| [Opal-A var. Opal-AN] King, Vandall T., Foord, Eugene E. (1994) Mineralogy of Maine Vol. 1 - Descriptive mineralogy. Maine Geological Survey. |
| [Opal-A var. Opal-AN] |
| [Opal-A var. Opal-AN] Dionne, Dick & Birtic, Cal & Jacobson, Mark. (2014) The Perry petalite prospect of Peru, Maine.. Mineral News. 30. 6,8,9,11,13. |
| [Opal-A var. Opal-AN] |
| [Opal-A var. Opal-AN] A.Mathauser collection |
Hayes Ledge Quarries, Greenwood, Oxford County, Maine, USA