ʻO Amethyst kahi ʻōnaehana kristal tripartite, ʻo ke aniani he kolamu hexagonal, ʻo ka ʻili cylindrical he transverse, aia ke ʻano hema a me ke ʻano ʻākau, maʻamau loa ka māhoe-crystal.ʻO ka paʻakikī he 7. Loaʻa pinepine ka aniani i nā ʻāpana kinoea-wai ʻēheu ʻēheu.