Citation: Mills, S. J.; Kampf, A. R.; Williams, P. A.; Leverett, P.; Poirier, G.; Raudsepp, M.; Francis, C. A. (2010). Hydroniumpharmacosiderite, a new member of the pharmacosiderite supergroup from Cornwall, UK: structure and description. Mineralogical Magazine, 74, pp. 863-869.