gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1996.060.399.13 Short Communications Subsilicic Sodium Gedrite in Leptite of Quartz Keratophyric Origin, Nordmark (Sweden) Linthout Kees Lustenhouwer Wim J. Institute of Earth Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands 4 1996 60 399 379 387 18 1 1995 29 3 1995 Copyright © 1996, The Mineralogical Society 1996 Keywords subsilicic sodium gedrite quartz keratophyric protolith Nordmark Sweden