Realgar, Orpiment

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A scarce specimen of Peruvian realgar with fine, pretty crystals of unusual form, with minor association of yellow orpiment. These are both arsenic sulfide, and in fact most manifestations of realgar degrade to orpiment over time. Orpiments are not uncommon from Peru, of course, but good realgars are. The combo is striking, and I saw only one small find of this at Denver. Under strong light, this specimen lights up an INTENSE red color.