Tags: Chemical Substance, Mineral.
Jolliffeite is a rare selenide mineral with formula NiAsSe or (NiCo)AsSe. It is the selenium analogue of the sulfide mineral gersdorffite NiAsS with a common impurity of cobalt CoAsSe. It is named for its discoverer Alfred Jolliffe (1907–1988) a Canadian geologist of Queen’s University Kingston Ontario.