gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1998.62A.1.284 Measurement of Sulphur Isotopic Compositions of Sulphide Minerals Using New Continuous He-Flow EA-MS Technology Grassineau N. V. Mattey D. P. Lowry D. Department of Geology, Royal Holloway University of London, Egham, Surrey TW20 0EX, UK 1998 62A 1 537 538 Copyright © 1998, The Mineralogical Society 1998