Refractive indices of some carbonate minerals in the point dipole approximation

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Abstract
The refractive indices of minerals with the calcite and aragonite structures are analyzed in the point dipole approximation to give values for the polarizabilities of the individual ions. It is found that the experimental measurements are consistent with several models for the polarizability of the carbonate group, but that the use of a single anisotropic polarizability for the whole group is unreliable. Emphasis is placed on the use of the Ewald transformation and on the correct use of symmetry to increase the efficiency of the calculations.

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