phonolite
/ˈfoʊnəlaɪt/
noun
- A type of volcanic rock that makes a ringing sound when struck.
- Phonolite is often used in construction because of its durability and unique sound.
- Geologists study phonolite to learn more about ancient volcanic eruptions.
- The hiker picked up a piece of phonolite and tapped it with his hammer, hearing a clear ring.