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USA | |
| Cahoon, James C. (1985). Massachusetts: A Classic Swiss Alpine Cleft Mineral Region (Boston Mineralogical Symposium program book, May 1985) |
| Cahoon, James C. (1985). Massachusetts: A Classic Swiss Alpine Cleft Mineral Region (Boston Mineralogical Symposium program book, May 1985) |
| P Cristofono collection 2010 |
| [var. Phacolite] Collected by L.White 1980 |
| Tschernich, Rudy W. (1992) Zeolites of the World. Geoscience Press, Inc., Phoenix, Arizona. 567pp. Dana, Edward Salisbury (1892) A System of Mineralogy (6th ed.) |
| P. Cristofono collection |
| P. Cristofono collection |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| Smith, Arthur E. (2005) New Hampshire mineral locality index. Rocks & Minerals, 80 (4) 242-261 doi:10.3200/rmin.80.4.242-261 |
| Tom Mortimer collection, www.mindatnh.org |
Aggregate Industries Quarry, Ashland, Middlesex County, Massachusetts, USA