Naica’s ”Cueva de los Cristales” was discovered in 2000. It has been considered particularly interesting for its beauty and the challenges it poses to crystallography. This article focuses on the study of the wall-selenite interface by various techniques, particularly X-ray diffraction (XRD), scanning electron microscopy (SEM), with emphasis on micro-X-ray fluorescence (micro-XRF) and micro-X-ray absorption near edge structure (micro-XANES). The main phases calcite, quartz, goethite and montmorillonite were identified by XRD, as well as the association of crystalline and amorphous minor and trace phases of Zn, Mn, Cu, As and Pb. The latter were identified in micro-XRF maps and micro-XANES spectra. The results for the morphology and the chemical description of the crystal-wall interface may contribute to propose a nucleation and growth mechanism for Naica megacrystals.
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SUPLEMENTO DE LA REVISTA MEXICANA DE FÍSICA, year 7, issue 1, April, 2026. Electronic journal, non-periodical, published by Sociedad Mexicana de Física, A. C. Departamento de Física, 2º Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510, Ciudad de México. Apartado Postal 70-348. Tel. (+52) 55-5622-4946, (+52) 55-5622-4848, https://rmf.smf.mx/ojs/index.php/rmf-s, rmf@ciencias.unam.mx. Chief Editor: Ramón Castañeda Priego, División de Ciencias e Ingenierías, Universidad de Guanajuato. INDAUTOR Certificate of Reserve: 04-2022-111014290100-203, e-ISSN: 2683-2585, both granted by Instituto Nacional del Derecho de Autor. Responsible for the last update of this issue, Technical Staff of Sociedad Mexicana de Física, A. C., 2º. Piso, Facultad de Ciencias, Universidad Nacional Autónoma de México, Ciudad Universitaria, Alcaldía Coyacán, C.P. 04510 , Ciudad de México. Date of last modification, April 28, 2026.
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