Tags: Chemical Substance, Mineral.
Chapmanite is a rare silicate mineral belonging to the nesosilicate group discovered in 1924 and named in honour of the late Edward John Chapman (1821–1904) a geology professor at the University of Toronto. Chemically it is an iron antimony silicate closely related to bismutoferrite and may contain aluminium impurities. It is closely associated with silver mines most notably the Keeley mine in Ontario Canada found in quartz veinlets containing graphite in gneiss.
