composition « Back to Glossary IndexThe mineral make up of a rock, i.e. which minerals are found within a rock. Synonyms: composedRelated Articles: Glossary: polymorphismGlossary: mohoGlossary: felsicGlossary: carbonatite5 Weathering, Erosion, and Sedimentary Rocks« Back to Glossary Index Author: Chris Associate Professor, Salt Lake Community College, Salt Lake City, Utah View all posts by Chris