Figure F16. Photomicrographs showing plagioclase phenocrysts. A. Plagioclase megacryst with inclusion of olivine (Sample 197-1205A-15R-2, 138-140 cm) (cross-polarized light; field of view = 5 mm; photomicrograph 1205A-211). B. Rounded plagioclase phenocry

Figure F16. Photomicrographs showing plagioclase phenocrysts. K. Glomerocryst from Subunit 5b, composed of plagioclase, pyroxene, opaque minerals, and partially altered olivine (Sample 197-1205A-16R-2, 84-86 cm) (cross-polarized light; field of view = 5 mm; photomicrograph 1205A-214). L. Subophitic texture in Subunit 3b, with a large groundmass clinopyroxene crystal enclosing a partially altered olivine phenocryst (Sample 197-1205A-12R-2, 114-116 cm) (cross-polarized light; field of view = 1.25 mm; photomicrograph 1205A-205).