gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1954.030.225.03 The Orthoclase-Microcline Inversion MacKenzie Wm. Scott M.A., B.Sc., Ph.D. Geophysical Laboratory, Carnegie Institution of Washington, Washington, D.C. 6 1954 30 225 354 366 Copyright © 1954, The Mineralogical Society 1954