Amphibolite is a type of metamorphic rock primarily composed of amphibole minerals, particularly hornblende, along with plagioclase feldspar. It typically forms under high-pressure and high-temperature conditions, often from the metamorphism of basalt or other mafic igneous rocks. The rock is usually dark in color, ranging from green to black, and has a coarse-grained texture. This rock is commonly found in regions that have experienced significant tectonic activity, such as mountain ranges. Amphibolite is important in geology as it provides insights into the conditions of metamorphism and the geological history of an area. It is also used in construction and as a decorative stone.