title: A vibrational spectroscopic study of the anhydrous phosphate mineral sidorenkite Na3Mn(PO4)(CO3).
abstract: Sidorenkite is a very rare low-temperature hydrothermal mineral, formed very late in the crystallization of hyperagpaitic pegmatites in a differentiated alkalic massif (Mt. Alluaiv, Kola Peninsula, Russia). Sidorenkite Na3Mn(PO4)(CO3) is a phosphate-carbonate of sodium and manganese. Such a formula with two oxyanions lends itself to vibrational spectroscopy. The sharp Raman band at 959 cm(-1) and 1012 cm(-1) are assigned to the PO4(3-) stretching modes, whilst the Raman bands at 1044 cm(-1) and 1074 cm(-1) are attributed to the CO3(2-) stretching modes. It is noted that no Raman bands at around 800 cm(-1) for sidorenkite were observed. The infrared spectrum of sidorenkite shows a quite intense band at 868 cm(-1) with other resolved component bands at 850 and 862 cm(-1). These bands are ascribed to the CO3(2-) out-of-plane bend (ν2) bending mode. The series of Raman bands at 622, 635, 645 and 704 cm(-1) are assigned to the ν4 phosphate bending modes. The observation of multiple bands supports the concept of a reduction in symmetry of the carbonate anion from D3h or even C2v.
authors.affiliation: School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. Electronic address: r.frost@qut.edu.au.
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.affiliation: School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
authors.forename: Andrés
authors.initials: A
authors.lastname: López
authors.affiliation: Geology Department, School of Mines, Federal University of Ouro Preto, Campus Morro do Cruzeiro, Ouro Preto, MG 35,400-00, Brazil.
authors.forename: Ricardo
authors.initials: R
authors.lastname: Scholz
authors.affiliation: Federal University of Itajubá, Campus Itabira, Itabira, MG, Brazil.
authors.forename: Fernanda Maria
authors.initials: FM
authors.lastname: Belotti
authors.affiliation: School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Xi
mesh_terms: D000838:Anions; D002244:Carbon / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D017895:Manganese Compounds / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008903:Minerals; D010710:Phosphates / Q000737:chemistry*; D012964:Sodium / Q000737:chemistry*; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D013696:Temperature; D014732:Vibration
chemical_list: D000838:Anions; D017895:Manganese Compounds; D008903:Minerals; D010710:Phosphates; C000600935:sidorenkite; D008345:Manganese; D002244:Carbon; D012964:Sodium
keywords: Carbonate; Infrared spectroscopy; Phosphate; Raman spectroscopy; Sidorenkite