Aguilar-Reyes, Bertha Oliva, Mikhail Ostrooumov, and Emmanuel Fritsch. 2018. “Mineralogic Study of the Destabilization of Mexican Opals”. Revista Mexicana De Ciencias Geológicas 22 (3):391-400. https://rmcg.unam.mx/index.php/rmcg/article/view/846.