Montmorillonite from Massachusetts, USA
USA | |
| "Western Massachusetts Mineral Localities" by Plante, A.R., Valley Geology Press, 1992 |
| Emerson, Benjamin K. (1895) A mineralogical lexicon of Franklin, Hampshire, and Hampden counties, Massachusetts. Bulletin Vol. 126. US Geological Survey doi:10.3133/b126 |
| "Western Massachusetts Mineral Localites" by Plante, A.R., Valley Geology Press, 1992 |
| Gleba, Peter P. (2008) Massachusetts Mineral and Fossil Localities. Kreueger Enterprises, Inc. |
| Harvard Mineralogical Museum |