The Goldschmidt mineralogical formula is a special
The Goldschmidt mineralogical formula is a special case of this formula. Its derivation relies on setting all chemical potentials equal(*) to each other and obtaining a restriction on the number of allowed solutions. In form it is similar to Euler's polyhedral formula. For ten points, identify this formula which gives the number of degrees of freedom as the number of constituents minus the number of phases, plus two.
The Goldschmidt mineralogical formula is a special case of this formula.
Gibbs phase rule