Figure F27. Photomicrographs showing plagioclase (Sample 209-1275B-17R-1, 60-62 cm) (cross-polarized light: blue filter; field of view = 2.75 mm). A. Broken plagioclase crystals infilled and partially replaced by oxide (image 1275B_022). B. Plagioclase neoblasts developed at the junction of two grains (image 1275B-023).