Apr 03, 2010· The volume thermal expansion coefficient and the anisotropy of thermal expansion were determined for nine natural feldspars with compositions, in terms of albite (NaAlSi 3 O 8, Ab) and anorthite (CaAl 2 Si 2 O 8, An), of Ab 100, An 27 Ab 73, An 35 Ab 65, An 46 Ab 54, An 60 Ab 40, An 78 Ab 22, An 89 Ab 11, An 96 Ab 4 and An 100 by high resolution powder diffraction with a synchrotron …