Granite pegmatite. Graftonite type locality reported as "on the south side of Melvin Mountain, about 5 miles west of the village of Grafton" (Penfield 1900)
Mineral List
9 entries listed. 6 valid minerals. 1 type locality (valid mineral).
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References
- Penfield, S. L. (1900): On graftonite, a new mineral from Grafton, New Hampshire, and its intergrowth with triphylite. The American Journal of Science. 159, 20-32
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