firestone
nounUK /ˈfaɪəstəʊn/
US /ˈfaɪərstoʊn/
A firestone is a special stone that can handle very hot fire without breaking.
The old oven was built with firestones so it could get very hot.
OTHER MEANINGS
2. A flint or hard stone used to make sparks for starting a fire.
He struck the firestone to light the campfire.
3. A type of quartz that glows when heated or rubbed.
The firestone in the necklace seemed to shine with a warm light.
4. A brand name for a durable tire or rubber product.
The truck was fitted with Firestone tires for the long journey.