gannister
/ˈɡænɪstər/
noun
- A hard, fine-grained siliceous rock used for making refractory bricks for furnaces.
- Miners extracted gannister from the quarry for use in high-temperature applications.
- The factory used gannister to line the inside of the blast furnace.
- Gannister is essential for producing heat-resistant bricks in steelmaking.