Richard Gaal¹, Sofiane Schaak², UmbertoLuca Ranieri¹, Philippe Depond², Werner F Kuhs³, Philippe Gillet⁴, Fabio Finocchi⁵ and Livia Eleonora Bove⁶, (1)Ecole Polytechnique F_ed_erale de Lausanne, ICMP, EPSL, Lausanne, Switzerland, (2)Institut des Nanosciences de Paris, Sorbonne Universite, CNRS UMR 7588, Paris, France, (3)GeoZentrum Göttingen Abteilung Kristallographie, Universität Göttingen, Göttingen, Germany, (4)EPFL Swiss Federal Institute of Technology Lausanne, Lausanne, Switzerland, (5)University Pierre and Marie Curie Paris VI, INSP, Paris, France, (6)CNRS, Paris, France