Vitrification is described as the process by which silica is converted to glass by the action of heat and fluxes. A vitrified body is one in which some of the silica in the body has been converted from its crystalline to its glassy phase. If all of the silica in a body has been vitrified, it may slump in firing, and the finished pot will be very brittle.
Ref: 122708/2006-09-23

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China (China is characterized as 1) A porcelain clay. ..)

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