Orpiment, Calcite

This colourful specimen features bright yellow orpiment with calcite veins running through the matrix. There is also what looks like some minor getchellite or realgar present in spots. The specimen originates from the Getchell Mine, Potosi Mining District, Humboldt County, Nevada, the type locality for getchellite. Getchellite is a rare arsenic–antimony sulfide (AsSbS₃) that was first described from this deposit and named after the mine. The Getchell Mine, discovered in 1933 on the east flank of the Osgood Mountains, is best known as a significant underground gold producer, but it also yielded a small number of highly distinctive arsenic mineral specimens during periods of active mining, particularly from the 1960s through the 1980s.

This piece comes from the collection of Peter Tarassoff and was acquired in 1968.