Raman spectroscopic study of the mineral gerstleyite Na2(Sb,As)8S13·2H2O and comparison with some heavy-metal sulfides

Authors

  • Ray L. Frost,

    Corresponding author
    1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia
    • Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia.
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  • Silmarilly Bahfenne,

    1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia
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  • Eloise C. Keeffe

    1. Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia
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Abstract

The mineral gerstleyite is described as a sulfosalt as opposed to a sulfide. This study focuses on the Raman spectrum of gerstleyite Na2(Sb,As)8S13·2H2O and makes a comparison with the Raman spectra of other common sulfides including stibnite, cinnabar and realgar. The intense Raman bands of gerstleyite at 286 and 308 cm−1 are assigned to the SbS3E antisymmetric and A1 symmetric stretching modes of the SbS3 units. The band at 251 cm−1 is assigned to the bending mode of the SbS3 units. The mineral stibnite also has basic structural units of Sb2S3 and SbS3 pyramids with C3v symmetry. Raman bands of stibnite Sb2S3 at 250, 296, 372 and 448 cm−1 are assigned to Sb[BOND]S stretching vibrations and the bands at 145 and 188 cm−1 to S[BOND]Sb[BOND]S bending modes. The Raman band for cinnabar HgS at 253 cm−1 fits well with the assignment of the band for gerstleyite at 251 cm−1 to the S[BOND]Sb[BOND]S bending mode. Raman bands in similar positions are observed for realgar AsS and orpiment As2S3. Copyright © 2010 John Wiley & Sons, Ltd.

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