anorthosite

Anorthosite is a type of igneous rock mainly composed of a mineral called plagioclase feldspar, which gives it a light color. It forms when molten rock cools slowly beneath the Earth's surface, allowing large crystals to develop. Anorthosite is often found in the Earth's crust and is notable for its brightness and mineral content. It has been used historically in construction and sculpture and is significant in understanding the Earth's geological history, especially in regions like the Moon, where similar rocks are prevalent.