Figure F135. Photomicrographs showing microcracks. A. R- and P-shear microcracks in a plagioclase crystal (Sample 206-1256C-11R-7 [Piece 1B, 32-35 cm]; field of view = 0.625 mm; plane polarized light; thin section 80). B. Cracks sealed by saponite (b) crosscutting conjugate microcracks controlled by crystallographic cleavages (a) in plagioclase (Sample 206-1256D-2R-1 [Piece 1C, 53-56 cm]; field of view = 0.625 mm; plane polarized light; thin section 90). Pl = plagioclase.

Figure F135. Photomicrographs showing microcracks. A. R- and P-shear microcracks in a plagioclase crystal (Sample 206-1256C-11R-7 [Piece 1B, 32-35 cm]; field of view = 0.625 mm; plane polarized light; thin section 80). B. Cracks sealed by saponite (b) crosscutting conjugate microcracks controlled by crystallographic cleavages (a) in plagioclase (Sample 206-1256D-2R-1 [Piece 1C, 53-56 cm]; field of view = 0.625 mm; plane polarized light; thin section 90). Pl = plagioclase.