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://w.alexandrite.com/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 Jul. 18, 2026, 11:11 GMT).