gsminmag Mineralogical Magazine Mineralogical Magazine 0026-461X Mineralogical Society 10.1180/minmag.1995.059.397.23 Book Reviews Feldspars and Their Reactions Champness P. E. 12 1995 59 397 771 772 Parsons I. Feldspars and Their Reactions Kluwer Academic Publishers Dordrecht, Boston and London Price Dfl 390, £145 $223 0 7923 2722 5 Copyright © 1995, The Mineralogical Society 1995