1. Department of Chemistry, Texas A&M University, College Station, TX 77843, USA.
2. Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA.
3. Department of Geology and Geophysics, Texas A&M University, College Station, TX 77843, USA.
4. School of Earth and Environmental Sciences, The University of Queensland, St Lucia, QLD, Australia.