Lattice-energy minimization calculations have been performed for the feldspars low albite, maximum microcline, and anorthite using an ionic Bom-model potential. Analysis of earlier work shows that, although the bond lengths are simulated with reasonable accuracy using a two-body rigid-ion model, the bond angles display significant differences from the experimental results. The inclusion of three-body terms and polarization effects overcomes these problems. The T-O-T bond angles are particularly sensitive to the nature of the short-range cation-O potential.

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