dacite
/ˈdeɪsaɪt/
noun
- A type of volcanic rock that is light gray in color and contains quartz, feldspar, and other minerals.
- Geologists collected samples of dacite to study its mineral composition.
- The cliff was made of dacite, formed from an ancient volcanic eruption.
- Dacite is often found in lava domes and volcanic arcs around the Pacific Ocean.