gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1967.036.280.15 Short Communications A Note on Dr. M. J. Frost's Paper Axon H. J. Department of Metallurgy, The University, Manchester 13 12 1967 36 280 613 613 23 5 1967 Copyright © 1967, The Mineralogical Society 1967