ultramafic

« Back to Glossary Index

An igneous rock with extremely low silica composition, being made of almost all olivine and pyroxene. Ultramafic rocks contain very low amount of silica and are common in the mantle. Primary ultramafic rocks are komatiite (extrusive) and peridotite (intrusive).

« Back to Glossary Index

Author: Chris

Assistant Professor, Salt Lake Community College, Salt Lake City, Utah