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petuntse
Petuntse (from 白墩子 in pinyin: bai2 dun1 zi0), also spelled petunse, is a historic term for a wide range of micaceous or feldspathic rocks. However, all will have been subject to geological decomposition processes that result in a material which, after processing, is suitable as an ingredient in some ceramic formulations.
It was, and to a limited extent continues to be, an important raw material for Chinese porcelain, although the term pottery stone〔‘Chinese Porcelain’. N.Wood. ''Pottery Q''. 12, (47), 101, 1977〕〔‘State Of Flux - Feldspar Developments Continue Apace.’ ''Asian Ceramics''. September,2002,p.32-33,35,37.〕〔‘High Mechanical Strength Porcelain Body Prepared From Amakusa Pottery Stone Containing Soda Feldspar.’ K. Hamano, A.Hatano, S.Okada. ''J.Ceram.Soc.Jap.'' 101, No.9,1993, p.1038-1043.〕〔‘Refinement Of The Low-Grade Pottery Stone By Hydrothermal Treatment.’ K.Kimura, H.Tateyama, K.Jinnai. ''Deutsche Keramische Gesellschaft. Proc.Silicer '90 Nurnberg'', 26–28 September 1990, p.103-110.〕 is now used.
While sharing some similarities to the material known as China stone, which is found uniquely in southwestern England, they differ in mineralogy. However both are derived from the alteration of igneous rocks.
==References==
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