(B) Sebago pegmatite group, Maine; (C) Spodumene pegmatites of the Rumford pegmatite group, Maine; (D) Common pegmatites (Bon Ami, Hoot Owl, Sibelco), beryl pegmatites (Brushy Creek, Crabtree) and spodumene pegmatite (Ray) of the Spruce Pine pegmatite district, North Carolina. Laser-...