gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1995.059.396.21 Mineralogical Note Gratonite from the Isle of Man Alderton D. H. M. Mitchell D. Department of Geology, Royal Holloway (University of London), Egham, Surrey TW20 0EX, UK Giddens R. Department of Geology, Imperial College (London University), London SW7 2BP, UK 9 1995 59 396 573 574 21 11 1994 Copyright © 1995, The Mineralogical Society 1995 Gratonite Isle of Man