Figure F75. Color close-up photograph of Sample 183-1139A-71R-1 (Piece 2, 44-64 cm). Highly altered yellow-gray sanidine-phyric trachyandesite showing multiple alteration events. A moderately dipping transition into less-altered gray rock is visible at the top of the photo. The early yellow-gray alteration zone is overprinted by an oxidation halo near the bottom of the photo that is proximal to a deep red vein in Sample 183-1139A-71R-1 (Piece 3, 80 cm).