Yixing clay is a type of clay from the region near the city of Yixing in Jiangsu province, China. Its use dates back to the Song Dynasty (960 - 1279) when Yixing clay was first mined around Lake Taihu in China. From the 17th century on, the Yixing wares were commonly exported to Europe. The finished stoneware, which is used for teaware and other small items, are usually red or brown in color. They are known as Zisha ware, and are typically unglazed. The clays used for the Yixing wares are very cohesive and can be formed by slip molding, coil forming, or most commonly, slab forming. The clays can also be formed by throwing. The most famous wares made for yixing clay are Yixing clay teapots.