Figure F60. Jasperoidal silica breccia cement from Unit 5. Both images are from interval 193-1189B-6R-1, 13-15 cm. A. Jasperoidal quartz showing strong red internal reflections (in cross-polarized reflected light; width of view = 1.4 mm [Photomicrograph ID# 1189B_13; thin section 116]). B. Hematite completely enclosed in crystalline quartz. The opaque phase is pyrite (in cross-polarized reflected light; width of view = 1.4 mm [Photomicrograph ID# 1189B

Figure F60. Jasperoidal silica breccia cement from Unit 5. Both images are from interval 193-1189B-6R-1, 13-15 cm. A. Jasperoidal quartz showing strong red internal reflections (in cross-polarized reflected light; width of view = 1.4 mm [Photomicrograph ID# 1189B_13; thin section 116]). B. Hematite completely enclosed in crystalline quartz. The opaque phase is pyrite (in cross-polarized reflected light; width of view = 1.4 mm [Photomicrograph ID# 1189B_14; thin section 116]).