C. REFLECT & DISCUSS The rock shown in Fig. A5.2.2ª has a porphyritic texture, which means that it contains two sizes of crystals. The large white plagioclase crystals are called phenocrysts and are in a green-gray groundmass of more abundant, smaller crystals. Based on your work in part A, explain how this texture might have formed. More than one potentially correct answer is possible. Figure A5.2.2

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