Sandstone is a clastic sedimentary rock composed mainly of silicate minerals. Silicate minerals are quartz and felspar, both present in granite, quartzite and even in engineered stones, like quartz stone and sintered stone. Sandstone is a natural stone type and it may be any colour. Most common sandstone colours are tan, brown, yellow, red, grey, pink, white and black. Depending on the formation process, some sandstones have excellent long-term weather resistance, hence used for paving and external cladding. Untreated sandstone is naturally slip resistant.