gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.3.24 Majorite Destabilisation on Decompression: Constrains from Natural Samples on Plume Velocity Sautter V. Laboratoire de minéralogie, ESA C.N.R.S. 7058, Muséum National d'Histoire Naturelle, 61 Rue Buffon, 75005 Paris Harte B. Dept. of Geology and Geophysics, Grant Instirute of Geology, University of Edinburgh, EH9 3JW, Scotland, UK Harris J. W. Dept. of Geology and Applied Geology, University of Glasgow, G12 8QQ, Scotland, UK 1998 62A 3 1320 1321 Copyright © 1998, The Mineralogical Society 1998