basalt
nounUK /ˈbæs.ɔːlt/
US /bəˈsɔːlt/
Basalt is a dark, hard rock that comes from volcanoes.
The cliffs by the sea are made of black basalt.
OTHER MEANINGS
2. A fine-grained dark rock used for building and road stones.
The old road was paved with crushed basalt.
3. A type of dark gray or black color resembling the rock.
She painted the wall a deep basalt gray.
4. A hard-wearing material used in making statues and monuments.
The museum displayed a basalt statue from ancient Egypt.