1. Department of Earth and Environmental Sciences, University of Manchester, Manchester, M13 9PL, U.K.
2. ‡ Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.
3. Department of Basic Science, Graduate School of Arts and Sciences, University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-0041, Japan
4. Centre de recherches pétrographiques et géochimiques, CNRS, Université de Lorraine, 15, rue Notre-Dame-des-Pauvres, 54500 Vandoeuvre-lés-Nancy, France
5. † Current address: TOTAL, Centre Scientifique et Techniques Jean-Féger, Pau, France.
6. Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada