What does firestone mean in pottery?

In pottery, "firestone" typically refers to a type of clay or stoneware that can withstand high temperatures during firing. It is valued for its durability and ability to retain heat, making it ideal for functional pottery items like cookware. The term can also denote specific types of ceramic materials known for their strength and resistance to thermal shock. Firestone pottery often features rich textures and colors due to the unique mineral composition of the clays used.