gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1975.040.309.08 High-Temperature Homogenization Behaviour of Some Sodic Microperthites Parsons Ian Department of Geology and Mineralogy, University of Aberdeen, Aberdeen AB9 1AS, Scotland 3 1975 40 309 59 64 6 3 1974 13 5 1974 Copyright © 1975, The Mineralogical Society 1975 Summary

While undergoing ‘dry’ homogenization at 980 °C the ¯201 X-ray reflections of sodic low-albite-microcline microperthites show that phase compositions recapitulate (but in a reverse timesense) the unmixing history of ordered feldspars about a solvus with a critical composition near 26 mole per cent KA1Si3O8.