Joppa Hill is on the Amherst-Bedford line. This mineral list includes occurrences in both towns. Vesuvianite crystals from this locality were illustrated in the 2nd edition of Dana's System of Mineralogy (1844). Other references include: Jackson, 1844: Final Report on The Geology and Mineralogy of NH; Hitchcock, 1877: Geology of NH, Vol.II; Hawes, 1878: Geology of NH, Vol.III, Part IV; Meyers & Stewart, 1956: The Geology of NH.; Morrill, 1960: NH Mines & Mineral Loc., 2nd ed; and Rocks & Min. 40:26-27, (Jan. 1965).