Figure F31. Quartz ± pyrite amygdules within a completely altered volcanic rock, Unit 11. Epoxy cement filling the center of partially filled vesicles shows apparent high relief arising from grinding marks on the underlying glass slide (Sample 193-1189B-8R-1 [Piece 10, 37-40 cm]; width of view = 2.75 mm). A. Photomicrograph in plane-polarized light (Photomicrograph ID# 1189B_28; thin section 118). B. Photomicrograph in cross-polarized light (Photomicrograph ID# 1189B

Figure F31. Quartz ± pyrite amygdules within a completely altered volcanic rock, Unit 11. Epoxy cement filling the center of partially filled vesicles shows apparent high relief arising from grinding marks on the underlying glass slide (Sample 193-1189B-8R-1 [Piece 10, 37-40 cm]; width of view = 2.75 mm). A. Photomicrograph in plane-polarized light (Photomicrograph ID# 1189B_28; thin section 118). B. Photomicrograph in cross-polarized light (Photomicrograph ID# 1189B_29; thin section 118).