Amethyst ndeye tripartite crystal system, iyo crystal ine hexagonal columnar, iyo cylindrical pamusoro inochinjika, kune yakasara chimiro uye chimiro chekurudyi, mapatya-crystal akajairika.Iyo yakaoma ndeye 7. Iyo kristaro inowanzove ine zvisingaite kana mapapiro gas-liquid inclusions.