gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1940.025.170.05 Bravoite from Mill Close Mine, Derbyshire Bannister F. A. M.A. Hey M. H. M.A., D.Sc. Mineral Department, British Museum 9 1940 25 170 609 614 Copyright © 1940, The Mineralogical Society 1940