Index No: MRTN103070; Collected By: Thomas B. Nolan; Sample Type: hand sample; Notes: Location taken from Tonopah Extension Mine shaft; Dense, fine-grained, white and gray quartz locally almost chalcedonic with a few vugs and almost no sulfides. One piece has abundant white, clay-like areas of moderate birefergence and u greater than 1.54. Probably sericite.