Abstract
It is shown that large-angle convergent-beam electron diffraction can be used successfully to characterize crystal defects in a radiation-sensitive material such as quartz. The cases of perfect 1/3(21 10) dislocations, partial 1/6(21 13) dislocations and Dauphinà twin boundaries are considered successively. The identification of 1/6(21 13) dislocations represents the first analysis of partial dislocations in quartz.