Why is tonalite considered a coarse-grained felsic rock?
A) It contains very little silica.
B) It contains a lot of silica and feldspar.
C) It contains a lot of silica and magnesium.
D) It contains a lot of iron and magnesium.

Question

Quizplus · Accepted Answer

Tonalite is considered coarse-grained because its mineral grains are relatively large and easily visible to the naked eye. It is also considered felsic because it contains a high percentage of feldspar and silica, which are typically found in continental crustal rocks.

Why Is Tonalite Considered a Coarse-Grained Felsic Rock