A combined microstructural, X-ray texture goniometry and transmission electron microscopy study has been undertaken to document rare examples of c direction of slip in naturally deformed quartz. The presence of optically visible basal (0001) subgrain boundaries and strong concentrations of c axes parallel to the inferred shearing direction (close to the stretching lineation) are considered characteristic of c slip. Dominant c slip appears to be limited to high-temperature (>650 °C) and possibly hydrous conditions. The possibility of plastic softening associated with the relatively easy glide on this system is discussed.

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