In a porphyritic volcanic rock, which mineral grains are the last to crystallize?

Name: In a porphyritic volcanic rock, which mineral grains are the last to crystallize?
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In a porphyritic volcanic rock, the matrix or groundmass, which consists of fine-grained minerals, is the last to crystallize. Phenocrysts are the larger crystals that form earlier in the cooling process, while the groundmass fills in the spaces around them as the magma cools and solidifies.

In a Porphyritic Volcanic Rock, Which Mineral Grains Are the Last