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A new series of aluminogermanate alkali feldspars has been synthesized as part of a study to investigate elastic strain energies in exsolved samples. Enthalpies of solution in 20.1 wt% hydrofluoric acid (HF) at 50 °C for chemically homogeneous unstrained members of this series can be expressed as a function of mole fraction K (N OrGe ): -H soln  (kJ/mol) = 630.65 + 9.92 N OrGe  - 47.0 N 2   OrGe  + 17.6 N 3  OrGe . The associated enthalpies of mixing, H ex  (kJ/mol) = 29.4 N OrGe  N 2   AbGe  + 11.9 N AbGe  N 2  OrGe  (where N AbGe  is mole fraction Na), reach maximum values of 5.4 kJ/mol at sodic compositions, similar in behavior to normal aluminosilicate analogs.

Elastic strain enthalpies of exsolution: HF solution calorimetric experiments on alkali aluminosilicate and aluminogermanate feldspars