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Abstract
Nineteen samples of naturally occurring elemental sulfur or “selensulfur” were investigated by neutron activation analysis, Raman spectroscopy and high-pressure liquid chromatography. The natural sulfur samples contained between < 1 and 682 ppm selenium while nine industrially produced sulfur samples showed Se contents of ≤ 4 ppm. The existence of a mineral “selensulfur” consisting of only S and Se in comparable concentrations seems doubtful. Elemental sulfur minerals containing > 150 ppm Se were found to be yellow at 77 K while pure ordinary sulfur (α-S8) is colorless at this temperature.