KARAMPELAS, S.; FRITSCH, E.; ZORBA, T.; PARASKEVOPOULOS, K. M.; SKLAVOUNOS, S. AN UPDATE IN THE SEPARATION OF NATURAL FROM SYNTHETIC AMETHYSTS. Bulletin of the Geological Society of Greece, [S. l.], v. 40, n. 2, p. 805–815, 2007. DOI: 10.12681/bgsg.16721. Disponível em: https://ejournals.epublishing.ekt.gr/index.php/geosociety/article/view/16721. Acesso em: 20 dec. 2024.