Getchellite is a rare sulfide of arsenic and antimony, AsSbS3, that was discovered by B. G. Weissberg of the New Zealand Department of Scientific and Industrial Research in 1963, and approved as a new species by the International Mineralogical Association in 1965.

Close to this temperature it sublimes (changes directly from a solid to a vapor) and recrystallizes on cooler surfaces as minute acicular black crystals.Melting point: 340 °C to 355 °C.

[8] In August 1962 Weissberg visited the Getchell mine at Adam Peak, about 32 km northeast of Golconda, in Humboldt County, Nevada, US.

[9] At the type locality getchellite is found in an epithermal (formed at low temperature) arsenical gold deposit in a narrow, steeply dipping fault zone cutting across interbedded shales, argillites (lithified muds and oozes) and limestones, near an intrusion of granodiorite.Associated minerals are orpiment, realgar, stibnite, cinnabar and quartz,[5] as well as galkhaite, laffittite, chabournéite, christite, lorandite, marcasite, barite, fluorite and calcite.

[4] Getchellite is found at the type locality in Nevada, United States, and also in Azerbaijan, China, Iran, Japan, Kyrgyzstan and Russia.