Index No: NBM055150; Collected By: ; Sample Type: hand sample; Notes: Turquoise nodules and veinlets in kaolinized, sericitized, silicified porphyritic rhyolite, some clear, glassy quartz veining, cavities in rock left by weathered-out feldspar phenocrysts lined with pale amber crystals--jarosite (?); crystalline sericite with trace amount of poorly-crystalline kaolinite replaces original plagioclase phenocrysts (XRD analysis by Li Hsu)