Diorite is an igneous rock that is primarily composed of plagioclase feldspar, along with smaller amounts of biotite, hornblende, and quartz. It is typically coarse-grained, meaning its mineral crystals are large enough to be seen with the naked eye. The rock is usually dark gray to black in color, giving it a distinctive appearance. Diorite forms from the slow cooling of magma beneath the Earth's surface, which allows the minerals to crystallize. It is often used in construction and as a decorative stone due to its durability and attractive appearance. Diorite can also be found in various geological settings around the world.