Figure F28. Assemblage of phenocrysts: euhedral plagioclase laths, subhedral pyroxenes, and olivine. A. Altered olivine (top of photograph, plane-polarized light). B. Pyroxene is orange to gray (crossed polars). Sample 185-801C-68R-2 (Piece 12, 121-131 cm); magnification = 50×; field of view = 5 mm.