peridotite
/ˌpɛrɪˈdoʊtaɪt/
noun
- A dark, dense igneous rock that is rich in the mineral olivine and is found deep in the Earth's mantle.
- Geologists study peridotite to understand the composition of the Earth's upper mantle.
- The mountain range contains large deposits of peridotite, which give the soil a greenish tint.
- Samples of peridotite were brought up from the ocean floor during the research expedition.