Figure F13. Typical texture of a basalt from Hole 1136A. An isolated subhedral plagioclase phenocryst lies in a groundmass of finer grains of plagioclase, clinopyroxene, titanomagnetite, and altered glass. Sample 183-1136A-16R-1 (Piece 2, 80-82 cm), plane-polarized light; width of field of view = 1 mm.