title: Vibrational spectra of the hydrated carbonate minerals ikaite, monohydrocalcite, lansfordite and nesquehonite.
abstract: The Raman (200-4000 cm(-1)) and infrared (600-4000 cm(-1)) spectra of four rare carbonate hydrate minerals are reported. These are naturally occurring and synthetic ikaite CaCO3.6H2O, and nesquehonite MgCO3.3H2O; natural monohydrocalcite CaCO3.H2O, and synthetic lansfordite MgCO3.5H2O. The spectra of synthetic ikaite partially substituted with 2H2O and also with 13C were measured, as were those of synthetic deuteriated nesquehonite. Spectra of ikaite and lansfordite, both of which decompose at room temperatures, were measured below 0 degrees C. Assignments of fundamental modes are proposed.
authors.affiliation: Department of Chemistry, Imperial College of Science, Technology and Medicine, London SW7 2AY, UK.
authors.forename: Esther E
authors.initials: EE
authors.lastname: Coleyshaw
authors.forename: Gregory
authors.initials: G
authors.lastname: Crump
authors.forename: William P
authors.initials: WP
authors.lastname: Griffith
mesh_terms: D002119:Calcium Carbonate / Q000737:chemistry*; D008274:Magnesium / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman
chemical_list: C005479:magnesium carbonate; D002119:Calcium Carbonate; D008274:Magnesium