Figure F59. Photomicrograph of a thin section without anhydrite veining (Unit 28), showing quartz ± pyrite amygdules in a fine-grained quartz-illite groundmass (interval 193-1188F-1Z-3, 86-89 cm, in plane-polarized light; width of view = 2.75 mm. Photomicrograph ID# 1188F-12; thin section 61).

Figure F59. Photomicrograph of a thin section without anhydrite veining (Unit 28), showing quartz ± pyrite amygdules in a fine-grained quartz-illite groundmass (interval 193-1188F-1Z-3, 86-89 cm, in plane-polarized light; width of view = 2.75 mm. Photomicrograph ID# 1188F-12; thin section 61).