Abstract
The growth sector boundaries in natural beryls have been investigated by means of X-ray topography and optical birefringence topography. The boundaries of the same families usually show no contrast by the two different topography techniques. The t-s boundaries show the dynamical interference fringes in the X-ray topographs, which is characteristic for translation-type boundaries. Their displacement vectors, determined from extinction behaviour of the fringes, are probably perpendicular to the corresponding boundaries respectively. In the birefringence topographs, the contrast of the boundaries of different families is attributed to the long range strain fields on the two sides of the boundaries. From the experimental results, we may recognize that the two different topographies are complementary in the study of growth sector boundaries.
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