Figure F19. Thin section of fracture-controlled alteration that has generated a jigsaw breccia texture on a centimeter to millimeter scale. Arrows = remnant, arcuate perlitic cracks enclosed around fragments that represent remnants of perlitic kernels and angular fragments defined by linear, quartz-filled veins (Unit 5; interval 193-1188A-7R-1 [Piece 18, 120-124 cm]; in crossed polarized light; width of view = 2.75 mm. Photomicrograph ID# 1188A

Figure F19. Thin section of fracture-controlled alteration that has generated a jigsaw breccia texture on a centimeter to millimeter scale. Arrows = remnant, arcuate perlitic cracks enclosed around fragments that represent remnants of perlitic kernels and angular fragments defined by linear, quartz-filled veins (Unit 5; interval 193-1188A-7R-1 [Piece 18, 120-124 cm]; in crossed polarized light; width of view = 2.75 mm. Photomicrograph ID# 1188A_32; thin section 5).