Figure F20. Photomicrograph in plane-polarized light of anhydrite-pyrite veining with well-developed siliceous halo hosted in green silica-clay altered volcanic rock. The vein has cut and filled two vesicles (interval 193-1188A-8R-1, 124-127 cm; width of view = 0.7 mm. Photomicrograph ID# 1188A

Figure F20. Photomicrograph in plane-polarized light of anhydrite-pyrite veining with well-developed siliceous halo hosted in green silica-clay altered volcanic rock. The vein has cut and filled two vesicles (interval 193-1188A-8R-1, 124-127 cm; width of view = 0.7 mm. Photomicrograph ID# 1188A_22, thin section 8).