Abstract
Specimens of synthetic quartz were examined by transmission electron microscopy. Dauphiné twins in (0001) sections, produced by cooling through the inversion temperature, were decorated at the boundaries by black spots caused by radiation damage in the microscope. These boundaries were straight lines following crystallographic directions. A misorientation between twins and matrix accounts for intensity differences between the two regions. The results are compared with those pbtained with (11 2 0) sections where fringe contrats at the twin boundary occurs because of differences in extinction distance for certain reflection Smaller, more numerous twins were formed in elctron damaged regions during exmination in the microscope.
Published Version
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