1. Université Clermont Auvergne, CNRS UMR6524, IRD, OPGC, Laboratoire Magmas et Volcans, F-63000 Clermont-Ferrand, France
2. ‡ Special collection papers can be found online at http://www.minsocam.org/MSA/AmMin/special-collections.html.
3. † Orcid 0000-0002-0862-6804.
4. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Massachusetts 02543, U.S.A.
5. Smithsonian Institution, National Museum of Natural History, PO Box 37012, MRC 119, Washington, D.C. 20013, U.S.A.
6. Centre de Recherches Pétrographiques et Géochimiques, UMR7358, CNRS—Université de Lorraine, BP20, 54501 Vandoeuvre-lès-Nancy Cedex, France
7. Laboratory for Ion Beam Physics, ETH Zürich, 8093 Zürich, Switzerland