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USA | |
| Miller, 1971. RI Minerals & Their Locations |
| Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, Ed., University of Rhode Island, Kingston |
| Rocks & Minerals 61:281-284 |
| Miller, C.E. (1972) Rhode Island Minerals and Their Locations. O.D. Hermes, ed. Kingston, RI. |
| Rocks & Minerals (1986) 61:264-275 Miller, C. E. (1971) Rhode Island Minerals and Their Locations, University of Rhode Island, Kingston |
| |
| Luetcke, Rolf (n.d.) Personal communication. |
| Rocks & Minerals (1986): 61: 286-289 Michael W. Kieron collection |
| Miller, C. E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, Ed., University of Rhode Island, Kingston |
| Rocks & Minerals (1986) 61:264-275 |
| Miller, C. E. (1971) Rhode Island Minerals and Their Locations, University of Rhode Island, Kingston |
| Rothenberg, Robert (2010), personal communication to Mindat.org. |
| Miller, C.E. (1971) Rhode Island Minerals and Their Locations, O. D. Hermes, ed., URI, Kingston |
| P. Cristofono collection, 2014 |
Poker Hill, Ashton, Cumberland, Providence County, Rhode Island, USA