Index No: NBM056220; Collected By: ; Sample Type: hand sample; Notes: Composite rock chip sample of limonitic chalcedony veins and wallrock from several different veins and stringers in unmarked 1m X 2m cut in resistant Tf. Limonitic chalcedony veins after opaline silica. Wallrock pervasively altered (argillization, adularization?) w biotite -> sericite, plagioclase -> clay/sericite? Sanidine is fresh (?) to milky. Veins are < 4 cm wide, with many orientations, but main fracture orientation is ~N30�-50�W with steep SW dip. -Weiss 5/04/95.