Figure F17. Photomicrograph of large blocky plagioclase phenocrysts in a microcrystalline groundmass of plagioclase, clinopyroxene (Cpx), and Fe-Ti oxides. Tecoblasts are present in some of the phenocrysts (Sample 329-U1365E-8R-2, 54–58 cm). Cross-polarized light at 5× magnification.
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