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HISTORY OF DEVELOPMENT
BARITE OF VIRGINIA
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abundant alteration analyses Appalachian Valley approximately associated minerals b&rite barite area barite deposits barite mining barite occurs barite veins bed-rock berite biotite breccia calcite chlorite coarsely crystalline Cockeysville Cockeysville marble color country rock crystalline barite crystals deposition of barite depth diabase diameter dikes dolomite enclosing rocks epidote exposed fault Fauquier County feldspar fissure fillings fissure veins fluorite folds formation fragments ginia gneiss granite granite-gneiss Grayson County Hewitt hornblende igneous inches known regarding limestone limonite mica miles mined and prospected northeast occurrence of barite open-cut origin outcrops Pegmatite Photomicrograph Piedmont Pittsylvania Counties Plate 30 probably Province pyrite quantities of barite quartz represents residual barite residual clay Ridge Roanoke schist schistose sericite shafts shales shallow Smyth County solutions southeast strike structure sulphate surface Tazewell Counties test pits texture tions tourmaline Triassic U. S. Geol varies Virginia barite Virginia Geological Survey wall-rock waters width