amphibolite

Amphibolite is a type of metamorphic rock formed when basalt or similar volcanic rocks are subjected to high heat and pressure deep within the Earth’s crust. It mainly consists of mineral pairs like amphibole and plagioclase feldspar. Amphibolite often has a dark color and a dense, heavy feel. It is used in construction, as a decorative stone, and sometimes as a source of valuable minerals. Its formation reflects significant geological processes, and it provides insights into the Earth's history and the conditions deep beneath the surface.