Which material is sometimes called china clay and is essential for making fine porcelain?

• A. Ball Clay
• B. China Clay
• C. Kaolin
• D. Fire Clay

Answer: (C)

Kaolin is the mineral often called china clay, and it is essential for fine porcelain because it provides the white color, smooth texture, and plasticity needed to form a strong, translucent body after firing. Its fine particle size and high purity allow the porcelain mix to flow when wet and then become hard and bright when fired, especially when combined with silica and a flux like feldspar. Other clays like ball clay offer plasticity but aren’t as white or refined, while fire clay is valued for high-temperature durability in other ceramic applications, not porcelain. So the material that fits the description is kaolin.