INFRA R ED SPECULAR REFLECTANCE SPECTRA OF PRESSED POLYCRYSTALLINE SAMPLES OF ALUMS − COMPARISON WITH SINGLE CRYSTAL SPECTRA. Geologica Macedonica, [S. l.], v. 34, n. 1, p. 5–14, 2020. Disponível em: https://js.ugd.edu.mk/index.php/GEOLMAC/article/view/3562. Acesso em: 4 may. 2026.