Index No: NBM055090; Collected By: ; Sample Type: hand sample; Notes: Sericitized, silicified porphyritic rhyolite, feldspar phenocrysts replaced by sugary, white alunite; contains books of cream-colored sericite, disseminated hematite-after-magnetite (mineral has blue-black coating but rust-red streak), some pulverent, chalky, chyrsocolla fracture coatings, yellow-green iron-oxide staining