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Raman spectroscopic study of the mineral gerstleyite Na 2 (Sb,As) 8 S 13 ·2H 2 O and comparison with some heavy‐metal sulfides
Author(s) -
Frost Ray L.,
Bahfenne Silmarilly,
Keeffe Eloise C.
Publication year - 2010
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.2627
Subject(s) - stibnite , raman spectroscopy , chemistry , antimony , realgar , analytical chemistry (journal) , cinnabar , sulfide , mineralogy , inorganic chemistry , sphalerite , optics , physics , pyrite , hematite , organic chemistry , chromatography
The mineral gerstleyite is described as a sulfosalt as opposed to a sulfide. This study focuses on the Raman spectrum of gerstleyite Na 2 (Sb,As) 8 S 13 ·2H 2 O 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 SbS 3 E antisymmetric and A 1 symmetric stretching modes of the SbS 3 units. The band at 251 cm −1 is assigned to the bending mode of the SbS 3 units. The mineral stibnite also has basic structural units of Sb 2 S 3 and SbS 3 pyramids with C 3 v symmetry. Raman bands of stibnite Sb 2 S 3 at 250, 296, 372 and 448 cm −1 are assigned to SbS stretching vibrations and the bands at 145 and 188 cm −1 to SSbS 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 SSbS bending mode. Raman bands in similar positions are observed for realgar AsS and orpiment As 2 S 3 . Copyright © 2010 John Wiley & Sons, Ltd.