Figure F77. Color close-up photograph of Sample 183-1139A-71R-2 (Piece 1, 48-60 cm). White to pink alteration halo around vein filled with quartz, siderite, and calcite. The vein and halo cut across and locally offset dark red oxidation bands within variably oxidized sanidine-phyric trachyandesite that has been locally brecciated. An abrupt transition is visible from 56 to 57 cm between red-gray and light gray trachyte. The latter possibly represents an earlier alteration event.