Citation: Hughes, J. M.; Starkey, S. J.; Malinconico, M. L.; Malinconico, L. L. (1987). Lyonsite, Cu3Fe4(VO4)6, a new fumarolic sublimate from Izalco volcano, El Salvador: Descriptive mineralogy and crystal structure. American Mineralogist, 72, pp. 1000-1005.