Index No: NBM052810; Collected By: ; Sample Type: hand sample; Notes: Sample of slightly altered ash-flow tuff (Tep-Tuff of Pahranagat). Limonite-coated fractures in ash-flow tuff. Feldspars are partly altered to clay, mafic minerals have been destroyed. prospect consists of small dump; adit appears to have been covered by road work, or maybe this is just related to development of spring, but too much rock has been moved.