Abstract
The coherent intergrowth in single crystals of several structural modifications of tridymite with or without cristobalite was found by the X-ray precession method. With three structural modifications plus cristobalite, there are eleven possible combinations of intergrowths. Nine of these combinations have been observed in synthetic and natural crystals. As an extreme case, the intergrowth of all four (MC, PO, and MX tridymites and low cristobalite) is described. This is the first description of intergrowth patterns involving so many of these SiO2 structural modifications.
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