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1100C

Mullite converts to cristobalite

The calcination of kaolin is normally done between 400-600C. However higher temperatures are employed to produce the spinel and mullite phases. If temperature is allowed to exceed 1100°C, a cristobalite will form.

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Glossary Cristobalite
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.

By Tony Hansen


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