fluorspar
/ˈflʊrˌspɑr/
noun
- A mineral made of calcium and fluorine, used in making steel, glass, and toothpaste, and in some chemical processes.
- Fluorspar is added to molten metal to help remove impurities during steel production.
- The mine in the mountains produces high-quality fluorspar for industrial use.
- Some toothpaste contains a small amount of fluorspar to help strengthen teeth.