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Non-refractory fire clay may be another key raw material.
Non-refractory fire clays, however, have larger amounts of mica and feldspar.
Terms such as "porcellaneous" or "near-porcelain" may be used in such cases.
One definition of stoneware is from the Combined Nomenclature of the European Communities, a European industry standard.
Exceptions to this include the unglazed Yixing clay teapot, made from a clay believed to suit tea especially well, and Shiwan ware, used for popular figures and architectural sculpture.
But in Japan many traditional types of stoneware, for example Oribe ware and Shino ware, were preferred for chawan cups for the Japanese tea ceremony, and have been valued up to the present for this and other uses.