The appropriate number of oxygens are added automatically for charge neutrality. The absolute value of these variables is not important, they must simply be in the appropriate ratio that the user wishes. All of these variables can be changed by the user to test alternate models. Al does substitute into this phase with 2 Al replacing a Mg-Si pair. The properties of the phases are given in a table.
Users can change any of the values.
P. 17 GPa is set as the default which corresponds to the depth of 500 km. At each condition, it then calculates the composition of each phase using the data of WW and it calculates the volume per cents of each phase. Then it calculates the properties of the phases and finally calculates the properties of the bulk mineralogy. Output is graphical and tabular. The graphing output is versatile allowing the user to view any of the calculated variables as a function of depth.