Figure F74. Photomicrographs showing groundmass pigeonite and granophyric intergrowths in fine-grained massive basalt from the lava pond (Sample 206-1256C-9R-8, 21-23 cm; width of view = 1.4 mm). A. Prismatic pigeonite in the core of augite. B. Intergrowths of quartz and sodic plagioclase.