A ________ igneous rock is one in which larger crystals are enclosed in a groundmass of much finer-grained material.
A) aphanitic
B) phaneritic
C) polyphonic
D) porphyritic
E) mylonitic

Question

Quizplus · Accepted Answer

Porphyritic igneous rock has larger crystals enclosed in a groundmass of finer-grained material. Aphanitic igneous rock is fine-grained all throughout, phaneritic igneous rock has visible crystals throughout, polyphonic is not a type of igneous rock, and mylonitic igneous rock has undergone significant deformation.

A ________ Igneous Rock Is One in Which Larger Crystals