Abstract
The overmuch rare lead arsenic sulfosalts, baumhauerite (Pb3As4S9), dufrénoysite (Pb2As2S5), gratonite (Pb9As4S15), sartorite (PbAs2S4), and seligmannite (PbCuAsS3), were investigated by Raman spectroscopy. Raman spectra of the investigated minerals arise from the stretching and bending modes of the isolated and interconnected AsS3 pyramidal groups. The As–S stretching vibrations of the studied minerals occur between 390 and 340 cm−1, whereas those of S–As–S bending modes between 335 and 220 cm−1. The shorter bond distances of the As–S readily elucidate the blue shift from seligmannite to gratonite, sartorite, dufrénoysite, and baumhauerite and the increase in full width at half maximum in similar modes. Copyright © 2016 John Wiley & Sons, Ltd.
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