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American Mineralogist; January 2007; v. 92; no. 1; p. 193-197; DOI: 10.2138/am.2007.2361
© 2007 Mineralogical Society of America
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Crystal structure of tooeleite, Fe6(AsO3)4SO4(OH)4·4H2O, a new iron arsenite oxyhydroxy-sulfate mineral relevant to acid mine drainage

Guillaume Morin1,*, Gwenaelle Rousse1 and Erik Elkaim2

1 Institut de Minéralogie et de Physique des Milieux Condensés, UMR 7590, CNRS—Université Pierre et Marie Curie—Université Denis Diderot—IPGP, 140 rue de Lourmel, 75015 Paris, France
2 Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin—BP 48 91192 Gif-sur-Yvette Cedex, France

Correspondence: * E-mail: guillaume.morin{at}impmc.jussieu.fr

The crystal structure of tooeleite, Fe6(AsO3)4(SO4)(OH)4·4H2O, 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, ß = 96.032(1)°, V = 560.27(3) Å3, dcalc = 3.16 g/cm3. The structure was solved by direct methods and atomic positions, site occupancies, and isotropic displacement parameters were refined by the Rietveld method. The AsO3 pyramids bond to FeO6 octahedra by both edge- and corner-linkage, forming layers that intercalate SO4 groups. Assignment of structural H2O 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.

Key Words: Crystal structure • tooeleite • XRD data • synchrotron powder diffraction • new minerals • geomicrobiology • acid mine drainage






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