Deep red translucent Realgar (AsS) crystals on matrix. Realgar is a photosensitive mineral and will alter to Pararealgar when exposed to light for long periods, but these crystals show no sign of alteration. Size of mineral specimen (cm): 4.5 x 3 x 3. From Getchell Mine, Adam Peak, Potosi Mining District, Osgood Mountains, Humboldt County, Nevada, USA














