Stoneware is clay burned at extra high temperature, approx. 1200 to 1300 degrees celsius. At this temperature the clay melts and becomes stoneware. Stoneware is more robust than porcelain and faience (earthenware).
Stoneware is especially recognized by the brownish and greenish hues and was mainly used for dishes, bowls, ashtrays, and the famous brown bears.
Examples of stoneware:
See other techniques here: