gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1990.054.374.18 Mineralogical Notes Mineral Nomenclature: Berndtite Polytypes Bayliss Peter Department of Geology and Geophysics, The University of Calgary, Alberta, Canada T2N 1N4 Clark Alan H. Department of Geological Sciences, Queens University, Kingston, Ontario, Canada K7L 3N6 3 1990 54 374 137 137 27 6 1989 29 8 1989 Copyright © 1990, The Mineralogical Society 1990 Keywords berndtite polytypes nomenclature