gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1929.022.126.02 A Relation Between the Density and Refractive Index of Silicate Glasses, with Application to the Determination of Imitation Gem-Stones Bannister F. A. M.A. Assistant-Keeper in the Mineral Department of the British Museum of Natural History. 9 1929 22 126 136 154 Copyright © 1929, The Mineralogical Society 1929