Definitions

1. adjective

describing a type of igneous rock that is extremely rich in magnesium and iron, and has a high concentration of olivine minerals

“The ultrabasic rocks found in the area were formed as a result of volcanic activity millions of years ago.”

2. noun

a type of igneous rock that is extremely rich in magnesium and iron, and has a high concentration of olivine minerals

“The geologist studied the ultrabasic rock formations in the region to understand their geological history.”