Forelesninger holdt ved Advanced Study Institute of Feldspar - Oslo 1962
Lectures held at Advanced Study Institute of Feldspar - Oslo 1962

Orville in his thesis "Alkali ion exchange between vapor and feidspar phases" [2] suggests a method for calculating the partial molar free energy of the pure alkali phases in the mixed crystal region. Orville studied the equilibrium of solubility of K + and Na+ in a vapor phase and in the alkali feldspar crystals; the vapor phase consisted of a 2- n solution of KCl and NaCl with different ratios of K and Na. The results for different temperatures at 2000 bars are given in Figure 3 of his paper in this volume (page FFF).