Electron Microscope Studies of MuIIite Development in Fired KaoIinites

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Abstract
Preshadowed carbon replicas were used to follow changes in surface texture of poorly crystallized and well‐crystallized kaolinites after firing to various temperatures between 850° and 1200°C. X‐ray diffraction was used for phase identification. Mullite was observed consistently in preferred orientation on the large well crystallized kaolinite stacks but not on poorly crystallized specimens. Failure to detect mullite in preferred orientation in the latter may be due to flow of the reaction products which occurs in these specimens at temperatures below that at which mullite can be detected by electron microscopy or X‐ray diffraction.

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