Frost, Ray LeslieLópez, AndrésXi, YunfeiCipriano, Ricardo Augusto ScholzGraça, Leonardo MartinsLagoeiro, Leonardo Evangelista2014-11-142014-11-142013FROST, RAY L. et al. Vibrational spectroscopic characterization of the sulphate mineral leightonite K2Ca2Cu(SO4)4 2H2O : implications for the molecular structure. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 112, p. 90-94, 2013. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142513003545>. Acesso em: 30 set. 2014.1386-1425http://www.repositorio.ufop.br/handle/123456789/3880The mineral leightonite, a rare sulphate mineral of formula K2Ca2Cu(SO4)4.2H2O, has been studied using a combination of electron probe and vibrational spectroscopy. The mineral is characterized by an intense Raman band at 991 cm^-1 attributed to the SO4^-2 m1 symmetric stretching mode. A series of Raman bands at 1047, 1120, 1137, 1163 and 1177 cm^-1 assigned to the SO4^-2 m3 antisymmetric stretching modes. The observation of multiple bands shows that the symmetry of the sulphate anion is reduced. Multiple Raman and infrared bands in the OH stretching region shows that water in the structure of leightonite is in a range of molecular environments.en-USLeightoniteSulphateMolecular structureRaman spectroscopyInfrared spectroscopyArtigo publicado em periodicoO periódico Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3481460482865.https://doi.org/10.1016/j.saa.2013.04.030