Index No: NBM056300; Collected By: ; Sample Type: hand sample; Notes: Select dump sample of altered, adularized rhyolite lava breccia cut by thin quartz veinlets and cemented by iron oxides, silica +/- drusy clear quartz - euhedral crystals < 2 mm long. Abundant limonitic and hematitic stain and fracture coatings. Probable flow breccia of phenocryst-poor devitrified rhyolitic lava. Sample is from shallow cut, ~1-2 m deep X 4 m long, on Stonewall Mountain east of Stonewall Spring. -Weiss 5/18/95.
