Diorite is an igneous rock that is primarily composed of plagioclase feldspar, along with smaller amounts of biotite, hornblende, and quartz. It is typically medium to coarse-grained, giving it a speckled appearance due to the contrasting colors of its mineral components. Diorite forms from the slow cooling of magma beneath the Earth's surface, which allows larger crystals to develop. This rock is often used in construction and decorative applications due to its durability and attractive appearance. Diorite can be found in various locations around the world, including regions of South America and North America, where it is often associated with volcanic activity.