Marble and quartzite are nonfoliated metamorphic rocks because
A) they are never found beneath fault zones or collisional mountain ranges.
B) both are dominated by minerals that produce equant grains.
C) both are dominated by minerals with crystalline structures that cannot be dissolved.
D) dynamothermal metamorphism can break down the structures of their constituent minerals,but the minerals are unstable in that metamorphic environment.

Question

Quizplus · Accepted Answer

Nonfoliated metamorphic rocks are dominated by minerals that produce equant grains. Both marble and quartzite have equant grains, which makes them nonfoliated metamorphic rocks. The other options are not true of all nonfoliated metamorphic rocks.

Marble and Quartzite Are Nonfoliated Metamorphic Rocks Because