cristobalite
/krɪˈstoʊbəlaɪt/
noun
- A type of mineral made of silicon dioxide, similar to quartz, often found in volcanic rocks.
- The scientist identified cristobalite in the rock sample using an X-ray machine.
- Volcanic ash can contain cristobalite, which is dangerous to breathe.
- Cristobalite is sometimes used in making dental materials because of its hardness.