Figure F19. Groundmass of a subhorizontal segregation. Euhedral plagioclase grains, less abundant clinopyroxene crystals, and abundant opaques with two distinct habits in a glass-rich groundmass. Sample 183-1136A-17R-1 (Piece 6, 60-64 cm) in plane-polarized light; width of field of view = 2 mm.