Definitions

1. adjective

Relating to or denoting a type of igneous rock that is rich in iron and magnesium, typically dark-colored and containing pyroxene minerals.

“The mafic rocks formed as a result of volcanic activity.”

2. noun

A type of igneous rock that is rich in iron and magnesium, typically dark-colored and containing pyroxene minerals.

“The geologist studied the mafic rocks to learn more about the Earth’s history.”