(Cu1-xAgx)7SiS5I mixed crystals were grown using the vertical zone crystallization method, they have been shown to crystallize in cubic structure (<$EF 4 Bar 3m>). The diffuse reflection spectra for the powders of (Cu1-xAgx)7SiS5I mixed crystals were measured at room temperature. Refractive indices and extinction coefficients for (Cu1-xAgx)7SiS5I mixed crystals were obtained from spectral ellipsometry measurements. A nonlinear decrease of the energy pseudogap and a nonlinear behavior with the maximum of refractive index have been revealed with increasing the Ag content. The dispersion of refractive indices of (Cu1-xAgx)7SiS5I has been described in the framework of different models.

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