What is "getchellite"

n. (context mineral English) A monoclinic-prismatic mineral containing antimony, arsenic, and sulfur.

Getchellite is a rare sulfide of arsenic and antimony, AsSbS, 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. Many metal sulfides are grey to black, but a few are brightly colored. Orpiment is yellow to brownish gold, cinnabar is deep red and getchellite is a bright orange red.