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In ceramics, cristobalite is a form (polymorph) of silica. During firing quartz particles in porcelain can convert to cristobalite. This has implications on the thermal expansion of the fired matrix.
In ceramics, cristobalite is a crystalline form of silica formed in the matrix of clay bodies as they fire in the kiln. Silica can also exist as quartz (the most common) and tridymite.