The summit of Jabal Maqlā consists mainly of dark-colored hornfels derived from metamorphosed volcanic rocks that originally were silicic and mafic lava flows, tuff breccias, and fragmental greenstones. The middle and lower slopes of Jabal Maqlā consist of light-colored granite, which has intruded into the overlying hornfels. This is the same granite that comprises Jabal al-Lawz.Trent, V.A., and R.F. Johnson (1967) Geologic map of the Jabal al Lawz Quadrangle, Kingdom of Saudi Arabia; 1:100,000. Mineral Investigation Map MI-13. United States Geological Survey, Reston, Virginia, and Mineral Resources Research, Directorate General of Mineral Resources. Saudi Arabia. Jabal Maqla is about 7 kilometers to the south, and a few hundred meters lower.
