Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/3797
Title: Raman spectroscopic study of the mineral qingheiite Na2(Mn2+,Mg,Fe2+)2(Al,Fe3+)(PO4)3, a pegmatite phosphate mineral from Santa Ana pegmatite, Argentina.
Authors: Frost, Ray Leslie
Xi, Yunfei
Cipriano, Ricardo Augusto Scholz
López, Andrés
Moreira, Caio
Lena, Jorge Carvalho de
Keywords: Phosphate
Pegmatite
Issue Date: 2013
Citation: FROST, RAY L. et al. Raman spectroscopic study of the mineral qingheiite Na2(Mn2+,Mg,Fe2+)2(Al,Fe3+)(PO4)3, a pegmatite phosphate mineral from Santa Ana pegmatite, Argentina. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy , v. 114, p. 486-490, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142513005374>. Acesso em: 30 de set. 2014.
Abstract: The pegmatite mineral qingheiite Na2(Mn2+,Mg,Fe2+)2(Al,Fe3+)(PO4)3 has been studied by a combination of SEM and EMP, Raman and infrared spectroscopy. The studied sample was collected from the Santa Ana pegmatite, Argentina. The mineral occurs as a primary mineral in lithium bearing pegmatite, in association with beausite and lithiophilite. The Raman spectrum is characterized by a very sharp intense Raman band at 980 cm^-1 assigned to the PO4^3- symmetric stretching mode. Multiple Raman bands are observed in the PO4^3- antisymmetric stretching region, providing evidence for the existence of more than one phosphate unit in the structure of qingheiite and evidence for the reduction in symmetry of the phosphate units. This concept is affirmed by the number of bands in the m4 and m2 bending regions. No intensity was observed in the OH stretching region in the Raman spectrum but significant intensity is found in the infrared spectrum. Infrared bands are observed at 2917, 3195, 3414 and 3498 cm^-1 are assigned to water stretching vibrations. It is suggested that some water is coordinating the metal cations in the structure of qingheiite.
URI: http://www.repositorio.ufop.br/handle/123456789/3797
metadata.dc.identifier.doi: https://doi.org/10.1016/j.saa.2013.05.048
ISSN: 1386-1425
metadata.dc.rights.license: O periódico Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3480320539883.
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