Figure F13. Many amygdules in altered dacite are filled by mosaic quartz ± pyrite ± anhydrite. In this photomicrograph they are <1 mm, and elongate amygdules define a general orientation of alignment (interval 193-1188F-1Z-3, 86-89 cm; width of view = 2.75 mm. Photomicrograph ID# 1188F

Figure F13. Many amygdules in altered dacite are filled by mosaic quartz ± pyrite ± anhydrite. In this photomicrograph they are <1 mm, and elongate amygdules define a general orientation of alignment (interval 193-1188F-1Z-3, 86-89 cm; width of view = 2.75 mm. Photomicrograph ID# 1188F_12, thin section 61).