Red sandstone is a type of sedimentary rock primarily composed of sand-sized grains of minerals, particularly quartz and feldspar, cemented together by iron oxide, which gives it a distinctive red color. This rock is commonly found in various geological formations and is often used in construction and landscaping due to its durability and aesthetic appeal. The formation of red sandstone typically occurs in arid or semi-arid environments, where ancient riverbeds or deserts deposited sand over time. Notable examples of red sandstone can be seen in the Grand Canyon and the Monument Valley, showcasing its striking colors and unique geological features.