High Quality Content by WIKIPEDIA articles! Stone Mountain is a quartz monzonite dome monadnock in Stone Mountain, Georgia, United States. At its summit, the elevation is 1,686 feet (513 m) amsl and 825 feet (251.5 m) above the surrounding area. Stone Mountain granite extends underground 9 miles (14 km) at its longest point into Gwinnett County. Numerous reference books and Georgia literature have dubbed Stone Mountain as “the largest exposed piece of granite in the world". This misnomer is most likely a result of advertisement by granite companies and early park administration. Stone Mountain, though often called a pink granite dome, actually ranges in composition from quartz monzonite to granite and granodiorite. Stone Mountain is well-known not only for its geology, but also for the enormous bas-relief on its north face, the largest bas-relief in the world. The carving depicts three figures of the Confederate States of America: Stonewall Jackson, Robert E. Lee, and Jefferson Davis.