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  • Title: Raman spectroscopy of the multi-anion mineral schlossmacherite (H3O,Ca)Al3(AsO4,PO4,SO4)2(OH)6.
    Author: Frost RL, Palmer SJ, Xi Y.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2012 Feb 15; 87():209-13. PubMed ID: 22169025.
    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.
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