An igneous rock with a mixed texture of coarse crystals (phenocrysts)surrounded by fine crystals (groundmass)is termed ________.
A)porphyritic
B)phaneritic
C)aphanitic
D)necrotic

Question

Quizplus · Accepted Answer

Porphyritic texture is characterized by the presence of two distinct crystal sizes - larger crystals called phenocrysts surrounded by smaller crystal matrix known as groundmass. The larger crystals are visible to the naked eye, while the smaller crystals may require a microscope for observation. Phaneritic texture, on the other hand, describes rocks that have coarse-grained textures with crystals large enough to be seen without the aid of a microscope, and aphanitic texture denotes rocks that are composed of fine-grained minerals that cannot be observed with the naked eye. Necrotic is not a geological term and is not related to rock textures.

An Igneous Rock with a Mixed Texture of Coarse Crystals