Citation: Fernandez-Martinez A; Timon, V.; Roman-Ross G; Cuello, G. J.; Daniels, J. E.; Ayora, C. (2010). The structure of schwertmannite, a nanocrystalline iron oxyhydroxysulfate Note: Model 2, positions of sulfate groups not determined. American Mineralogist, 95, pp. 1312-1322.