A Twinning Structure in Crystals of Aniline Hydrobromide, C₆ H₅ NH₃ Br

Abstract

A new twinning structure of aniline hydrobromide was found by means of an x-ray study. The twin elements are two-fold screw axes parallel to [011] and [0\bar11] through the origin. This type of twinning can be seen, in some cases, by an microscopic observation, especially by etch patterns on a cleaved plane parallel to (100). The formation of the twin will probably due to the difference of the growth rates in different crystallographic directions.