Citation: Majzlan, J.; Kiefer, B. (2006). An X-ray and neutron-diffraction study of synthetic ferricopiapite, Fe14/3(SO4)6(OD,OH)2(D2O,H2O)20, and ab-initio calculations on the structure of magnesiocopiapite MgFe4(SO4)6(OH)2(H2O)20 Note: hypothetical structure from ab-initio calculations. The Canadian Mineralogist, 44, pp. 1227-1237.