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USA | |
| Peter Cristofono collection and SEM-EDS data |
| Dennen, W. H. 1992, Bedrock geologic map of the Gloucester and Rockport Quadrangles, Essex County, Massachusetts |
| (1917) Geology of Massachusetts and Rhode Island. Bulletin Vol. 597. US Geological Survey doi:10.3133/b597 |
| "Western Massachusetts Mineral Localities" by Plante, A.R., Valley Geology Press, 1992 |
| Plante, Alan (1992): Western Massachusetts Mineral Localities (Valley Geology Press) |
| |
| "Western Massachuetts Mineral Localites" by Plante, A.R., Valley Geology Press, 1992 |
| "Western Massachusetts Mineral Localities" by Plante, A.R., Valley Geology Press, 1992 |
| Min Rec (1978) 9:235-242 |
| Min Rec (1978) 9:235-242 |
| Min Rec (1978) 9:235-242 |
| Min Rec (1978) 9:235-242 |
| Alan R. Plante, Personal field and lab notes, 1984-1987 |
| Plante, A.R. (1992) Western Massachusetts Mineral Localities. Valley Geology Press, 1992: 150 pgs. |
| P Cristofono collection |
| (1917) Geology of Massachusetts and Rhode Island. Bulletin Vol. 597. US Geological Survey doi:10.3133/b597 |
Betts Manganese Mines, Plainfield, Hampshire County, Massachusetts, USA