title: Raman and infrared spectroscopic characterization of beryllonite, a sodium and beryllium phosphate mineral - implications for mineral collectors.
abstract: The mineral beryllonite has been characterized by the combination of Raman spectroscopy and infrared spectroscopy. SEM-EDX was used for the chemical analysis of the mineral. The intense sharp Raman band at 1011 cm(-1), was assigned to the phosphate symmetric stretching mode. Raman bands at 1046, 1053, 1068 and the low intensity bands at 1147, 1160 and 1175 cm(-1) are attributed to the phosphate antisymmetric stretching vibrations. The number of bands in the antisymmetric stretching region supports the concept of symmetry reduction of the phosphate anion in the beryllonite structure. This concept is supported by the number of bands found in the out-of-plane bending region. Multiple bands are also found in the in-plane bending region with Raman bands at 399, 418, 431 and 466 cm(-1). Strong Raman bands at 304 and 354 cm(-1) are attributed to metal oxygen vibrations. Vibrational spectroscopy served to determine the molecular structure of the mineral. The pegmatitic phosphate minerals such as beryllonite are more readily studied by Raman spectroscopy than infrared spectroscopy.
authors.affiliation: School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane Queensland 4001, Australia. r.frost@qut.edu.au
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Xi
authors.forename: Ricardo
authors.initials: R
authors.lastname: Scholz
authors.forename: Fernanda M
authors.initials: FM
authors.lastname: Belotti
authors.forename: Luiz
authors.initials: L
authors.lastname: Alberto Dias Menezes Filho
mesh_terms: D001608:Beryllium / Q000737:chemistry*; D008903:Minerals / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman
chemical_list: D008903:Minerals; C032283:beryllium phosphate; D012964:Sodium; D001608:Beryllium