Bulletin, Ausgabe 67

accessory minerals amount apatite approximately Balfour Quarry bench-type quarry biotite biotite granite Blue Ridge boulder Central Piedmont chlorite Coastal Plain color commercial granite concrete aggregate crushed stone diabase dikes dimension granite dimension stone dimension-stone epidote even-granular feet feldspar following mineral composition gneisses granite granite and related granite areas granite deposits granite production Granite Quarry granite-gneiss granitic rocks Guilford County inches joints light gray magma magnetite marketed McLeansville medium-grained microcline mineral constituents muscovite North Carolina Northeast Piedmont Orthoclase outcrops pegmatitic Piedmont Plateau pink granite plagioclase plug and feather porphyritic principal production of crushed quarry quarry area quarry is developed Quarry is located quarrying operations quartz Quartz Orthoclase Plagioclase quartz-monzonite related rocks Residual overburden rock types Rolesville Rowan County Salisbury schistose schists sheeting planes shows the following texture thickness thin section U. S. Highway underlain utilized veins vicinity Volcanic-Slate Series Wake County Watson and Laney weathering Western Piedmont Woodleaf