Frankfurt equation of state. Shown are pressure contours as a function of density and temperature for a fully SiO₂ composition (Z = 1). Regions where the iso-pressure contour are vertical represent phase transitions. The LV-curve by Stull (1947) (used in Paper I) is given by the dashed curve, while the colored dots indicate the experimentally inferred curve by Kraus et al. (2012); the color indicates the pressure. The fit to the Kraus et al. (2012) data (solid black curve) is used in this work as the LV-curve.