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The crystal structure of tooeleite, Fe 6 (AsO 3 ) 4 (SO 4 )(OH) 4 ·4H 2 O, has been solved from high-resolution synchrotron XRD powder data recorded on a sample from Tooele county, Utah. The structure is monoclinic, space group C2/m, a = 8.9575(1), b = 6.4238(1), c = 9.7912(1) Å, β = 96.032(1)°, V = 560.27(3) Å 3 , d calc  = 3.16 g/cm 3 . The structure was solved by direct methods and atomic positions, site occupancies, and isotropic displacement parameters were refined by the Rietveld method. The AsO 3  pyramids bond to FeO 6  octahedra by both edge- and corner-linkage, forming layers that intercalate SO 4  groups. Assignment of structural H 2 O and OH groups were done from bond-valence analysis. Tooeleite is the only arsenite-sulfate mineral known and has been recently identified as the main constituent of stromatolite-like deposits in the Carnoulès acid mine, Gard, France.

Crystal structure of tooeleite, Fe 6 (AsO 3 ) 4 SO 4 (OH) 4 · 4 H 2 O, a new iron arsenite oxyhydroxysulfate mineral relevant to acid mine drainage