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Home > Explore! > Mineral Collecting > Collector's Guide to Maine Minerals > Chapter 5 > Porcupine Hill Quarry
Almandine (garnet) and schorl (tourmaline) crystals in pegmatite, Porcupine Hill Quarry, Topsham. Harvard University specimen H126493. Photo by Vandall T. King.
Last updated on October 6, 2005