1. Surface & Aqueous Geochemistry Group, Department of Geological & Environmental Sciences, Stanford University, Stanford, California 94305-2115, United States
2. Department
of Photon Science
and Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road,
Menlo Park, California 94025, United States
3. Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley California
94720, United States
4. Department
of Earth and Environmental
Sciences, Section Crystallography, University of Munich, Theresienstrasse 41, 80333 Munich, Germany
5. Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, D-14195 Berlin,
Germany