Titre du document / Document title

Crystal structure of tooeleite, Fe₆ (AsO₃ )₄SO₄(OH )₄·4H₂O, a new iron arsenite oxyhydroxy-sulfate mineral relevant to acid mine drainage

Auteur(s) / Author(s)

MORIN Guillaume ; ROUSSE Gwenaelle ; ELKAIM Erik ;

Résumé / Abstract

The crystal structure of tooeleite, Fe₆(As03)4(S04)(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, β = 96.032(1)°, V= 560.27(3) ų, d_calc = 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 comer-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.

Revue / Journal Title

The American mineralogist   ISSN 0003-004X   CODEN AMMIAY 

Source / Source

2007, vol. 92, n^o1, pp. 193-197 [5 page(s) (article)]

Langue / Language

Anglais

Editeur / Publisher

Mineralogical Society of America, Washington, DC, ETATS-UNIS  (1916) (Revue)

Localisation / Location

INIST-CNRS, Cote INIST : 503, 35400015956833.0200