Abstract
Two distinct modifications of AsS occur in the Alacrán Ag-As-Sb vein deposit in northern Chile. Of these, one, which crystallized early in the development of the deposit, apparently corresponds to the high temperature α-AsS polymorph (Hall, 1966), not previously documented from natural assemblages. Realgar which occurs as euhedral crystals in median vein cavities is similar, but not identical to “normal” realgar, or β-AsS, from other localities. The relationships between the two forms are poorly-defined, but neither exhibits instability on exposure to light or to infrared radiation.
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