Farid Juillot¹, Emmanuel Fritsch², Pauline Merrot², Gabrielle Dublet², Vincent Noel³, Georges Ona-Nguema², Pierre Le Pape², Cyril Marchand⁴, Jessica Brest², Maya Ikogou⁵, Gauthier Landrot⁶, Olivier Proux⁷, Jean-Louis Hazemann⁷, Luca Olivi⁸, John Bargar³, Gordon E Brown⁹ and Guillaume Morin¹⁰, (1)IMPMC: CNRS UMR 7590 - UPMC - MNHN - IRD, PARIS, France, (2)IMPMC Institut de Minéralogie et de Physique des Milieux Condensés, Paris Cedex 05, France, (3)SLAC National Accelerator Laboratory, Stanford Synchrotron Radiation Lightsource, Menlo Park, CA, United States, (4)ISEA - Universty of New Caledonia, Noumea, New Caledonia, (5)SOLEIL Synchrotron, SAMBA Beamline, Saint-Aubin, France, (6)SOLEIL Synchotron, SAMBA Beamline, Saint-Aubin, France, (7)University Joseph Fourier Grenoble, Grenboble, France, (8)ELETTRA Synchrotron, XAFS Beamline, Trieste, Italy, (9)Stanford University, Geological Sciences, Stanford, CA, United States, (10)IMPMC, UMR CNRS 7590, Sorbonne University, Paris, France