Repeated twining that tends to produce circular forms according to the same twin law but with the twin axis or twin planes, such as chrysoberyl or aragonite crystals having a pseudohexagonal symmetry.
See Alexandrite Tsarstone collectors guide, Definition of Cyclic twins, http://m.alexandrite.net/viewpage.html?id=GG-088-00012 (Repeated twining that tends to produce circular forms according to the same twin law but with the twin axis or twin planes, such as chrysoberyl or aragonite crystals having a pseudohexagonal symmetry.) (as of May. 21, 2026, 17:41 GMT).