Frost, Ray LeslieGobac, Željka ŽigovečkiLópez, AndrésXi, YunfeiCipriano, Ricardo Augusto ScholzLana, Cristiano de CarvalhoLima, Rosa Malena Fernandes2014-11-102014-11-102014FROST, RAY L. et al. Characterization of the sulphate mineral coquimbite, a secondary iron sulphate from Javier Ortega mine, Lucanas Province, Peru – Using infrared, Raman spectroscopy and thermogravimetry. Journal of Molecular Structure (Print), v. 1, p. 1, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S0022286014001586>. Acesso em: 04 de set. 2014.0022-2860http://www.repositorio.ufop.br/handle/123456789/3741The mineral coquimbite has been analysed using a range of techniques including SEM with EDX, thermal analytical techniques and Raman and infrared spectroscopy. The mineral originated from the Javier Ortega mine, Lucanas Province, Peru. The chemical formula was determined as (Fe1.37^3+; Al0.63)Σ2.00(SO4)3. 9H2O. Thermal analysis showed a total mass loss of ~73.4% on heating to 1000 °C. A mass loss of 30.43% at 641.4 °C is attributed to the loss of SO3. Observed Raman and infrared bands were assigned to the stretching and bending vibrations of sulphate tetrahedra, aluminium oxide/hydroxide octahedra, water molecules and hydroxyl ions. The Raman spectrum shows well resolved bands at 2994, 3176, 3327, 3422 and 3580 cm^-1 attributed to water stretching vibrations. Vibrational spectroscopy combined with thermal analysis provides insight into the structure of coquimbite.en-USCoquimbiteAmarantiteRaman spectroscopySulphateInfrared spectroscopyArtigo publicado em periodicoO periódico Journal of Molecular Structure concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3466021201372.https://doi.org/10.1016/j.molstruc.2014.01.086