What is a hard ceramic clay that was used to make sculptures?

A hard ceramic clay commonly used for making sculptures is stoneware clay. This type of clay is known for its durability and strength, allowing it to withstand high firing temperatures. Stoneware is often used by artists for its ability to hold fine details and textures, making it ideal for sculptural work. Its dense and non-porous nature also makes it suitable for both functional and decorative pieces.