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|Title: ||New type of cubic-stacked layer structure in anthoinite, AlWO3(OH)(3).|
|Authors: ||Grey, IE|
|Keywords: ||Democratic Republic of the Congo|
|Issue Date: ||Apr-2010|
|Publisher: ||Mineralogical Society of America|
|Citation: ||Grey, I. E., Madsen, I. C., Mills, S. J., Hatert, F., Peterson, V. K., & Bastow, T. J. (2010). New type of cubic-stacked layer structure in anthoinite, AlWO3(OH)(3). American Mineralogist, 95(4), 639-645. The Mineralogical Society of America, 3635 Concorde Pkwy Ste 500, Chantilly VA 20151-1125 USA (http://www.minsocam.org)|
|Abstract: ||Anthoinite, AlWO3(OH)3, from the Mt. Misobo Mine, Democratic Republic of the Congo, has triclinic symmetry with cell parameters a = 8.196(1) Å, b = 9.187(1) Å, c = 11.316(1) Å, = 92.82(1)°, β = 94.08(1)°, = 90.23(1)°, space group ґI, Z = 8. The structure was solved by applying ab initio structure solution methods (Reverse Monte Carlo/Simulated Annealing) to both X-ray and neutron powder diffraction data and was refined using the Rietveld method. The structure is built up of two types of M4(O,OH)16 planar tetrameric clusters of edge-sharing octahedra, one containing predominantly Al and the other predominantly W. The Al-rich and W-rich clusters interconnect via corner sharing to form stepped layers parallel to (001). The layers are held together by strong hydrogen bonding. The structure can be described as a rocksalt derivative structure, with the close-packed anion layers parallel to (012), and with Al and W atoms ordered into one third of the octahedral sites within the cubic close-packed anion lattice. The structure is complicated by partial disorder between Al and W in the tetrameric clusters and associated disorder in the H atom sites. Infrared and 27Al MAS NMR results are also presented for anthoinite. © 2010, Mineralogical Society of America|
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