1. Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, Indiana 46556, and Department of Crystallography, St. Petersburg State University, St. Petersburg 199034, Russia
2. Department of Chemistry, George Washington University, Washington, DC 20052, and Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015
3. Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, Indiana 46556