title: Raman spectroscopy of the multi-anion mineral schlossmacherite (H3O,Ca)Al3(AsO4,PO4,SO4)2(OH)6.
abstract: The mineral schlossmacherite (H(3)O,Ca)Al(3)(AsO(4),PO(4),SO(4))(2)(OH)(6), a multi-cation-multi-anion mineral of the beudantite mineral subgroup has been characterised by Raman spectroscopy. The mineral and related minerals functions as a heavy metal collector and is often amorphous or poorly crystalline, such that XRD identification is difficult. The Raman spectra are dominated by an intense band at 864cm(-1), assigned to the symmetric stretching mode of the AsO(4)(3-) anion. Raman bands at 809 and 819cm(-1) are assigned to the antisymmetric stretching mode of AsO(4)(3-). The sulphate anion is characterised by bands at 1000cm(-1) (ν(1)), and at 1031, 1082 and 1139cm(-1) (ν(3)). Two sets of bands in the OH stretching region are observed: firstly between 2800 and 3000cm(-1) with bands observed at 2850, 2868, 2918cm(-1) and secondly between 3300 and 3600 with bands observed at 3363, 3382, 3410, 3449 and 3537cm(-1). These bands enabled the calculation of hydrogen bond distances and show a wide range of H-bond distances.
authors.affiliation: Chemistry Discipline, Faculty of Science and Technology, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia. r.frost@qut.edu.au
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Sara J
authors.initials: SJ
authors.lastname: Palmer
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Xi
mesh_terms: D000838:Anions / Q000737:chemistry; D001149:Arsenates / Q000737:chemistry*; D019216:Metals, Heavy / Q000302:isolation & purification; D008903:Minerals / Q000737:chemistry*; D013059:Spectrum Analysis, Raman / Q000379:methods; D013431:Sulfates / Q000737:chemistry*
chemical_list: D000838:Anions; D001149:Arsenates; D019216:Metals, Heavy; D008903:Minerals; D013431:Sulfates