. "extrusive felsic rocks" . . "rhyolite" . "Metarhyolite" . . . . "rhyo" . . "porphyry" . . . "rhyolite tuff" . . "Rhyolitic lava flows" . . . "Rhyolite" . . "Rhyolite, Nevada" . . . "quartz porphyry" . . . "Castle Rock rhyolite" . . "rhyolitic" . . "rhyolitic vitrophyre" . . "rhyolites" . "liparitic" . "rhyolitic lava" . . "Rhyolitic" . "rhyolithic" . "Rhyolite" . "Quartz porphyry" .