Citation: Ventruti, G.; Scordari, F.; Schingaro, E.; Gualtieri, A. F.; Meneghini, C. (2005). The order-disorder character of FeOHSO4 obtained from the thermal decomposition of metahohmannite, Fe3+2(H2O)4[O(SO4)2] Sample: T = 220 C Note: this is a fictitious "superposition structure", resulting from Rietveld refinement of a structure with disordered layer stacking. American Mineralogist, 90, pp. 679-686.