Chalcedony Chalcedony Mylonite Weathering Amber Chalcedony Augusta and Rockingham County Cherts Black Chert Bolster's Store Chert Bourne Chert Brunswick County Quarry Little Cattail Creek Chert Coastal Chert Gray Chert Greenbrier Chert Helderberg Chert Mitchell Chert Rich Patch Chert Roanoke Region Chert Shenandoah Valley Chert Shriver Chert Trading Run Chert White & Gray Chert Wythe County Chert Pebble Jasper Chert I Pebble Jasper Chert II Arnolds Valley Jasper Bonnefont Jasper Brook Run Jasper Flint Run Jasper Pennsylvania Jasper Vein Quartz Aquia Orthoquartzite Erwin Antietam Quartzite Erwin Formation Green and Brown Quartzite Ferruginous Quartzite Magothy Formation Quartzite Nottoway River Quartzite Oolitic Quartzite Patuxent Mattaponi Formation Quartzite Ridgely Quartzite Maryland Rhyolites Morrow Mountain Rhyolite Mount Rogers Rhyolite Wolf Den Mountain Rhyolite Silicified Mudstone Silicified Sandstone Petrified Wood Greenstone Hornfels