anorthosite
/ˌænˈɔrθəsaɪt/
noun
- A type of igneous rock composed mostly of the mineral plagioclase feldspar, often found on the Moon and in some mountain ranges on Earth.
- Anorthosite is a light-colored rock that forms deep within the Earth's crust.
- The lunar highlands are made largely of anorthosite.
- Geologists collected samples of anorthosite from the Canadian Shield.