Figure 8.03. KAlSi2O6-SiO2 equilibrium phase diagram. Phases at equilibrium for the chemical system KAlSi2O6-SiO2 are shown as a function of chemical composition (weight percent SiO2) and temperature. The liquid only region is bounded by four liquidus curves, each of which is a saturation curve for one of the four minerals: leucite (Lct), sanidine (Sa), tridymite (Trd), or cristobalite (Crs). A red line has been added at 20 weight percent SiO2 to mark the equilibrium crystallization path described in the text. Click on the "Show Phase %" button and move your mouse along the red line. This diagram was determined experimentally by Schairer and Bowen (1938, 1955) at atmospheric pressure (1 bar).
Wt.% SiO2:
Temperature:
Wt.% Liq:
Liq. Comp:
Wt.% Lct:
Wt.% Sa:
Wt.% Crs:
Wt.% Trd:
