The aphanitic equivalent of diorite is
A)andesite
B)basalt
C)komatiite
D)rhyolite

Question

Quizplus · Accepted Answer

The aphanitic equivalent of diorite is andesite because both rocks have a similar composition of plagioclase feldspar and dark-colored minerals, such as hornblende and biotite. However, diorite has a phaneritic texture, meaning its crystals are visible to the naked eye, while andesite has an aphanitic texture, which means its crystals are too small to see without a microscope. Therefore, andesite is the best choice for the aphanitic equivalent of diorite.

The Aphanitic Equivalent of Diorite Is