Keywords: Bulletin 426 Plate XIV A Pegmatite vein.jpg Pegmatite vein with quartz center Harris clay mine northeast pit 2 1/4 miles north of Bryson NC 1910 Granites of the Southeastern Atlantic States Bulletin 426 United States Geological Survey Government Printing Office Washington 1910 Watson Thomas Leonard other versions PD-USGov Geology Pegmatite Quarrying |