The dataset supports the manuscript on "Wavelength dependent Mid-infrared Optical Constants (5-25 µm) of silicate glasses: A Genetic Algorithm approach" submitted by the authors to Earth and Space Science. data.xlsx - contains the measured micro-FTIR spectra, the modeled reflectance spectra by the GA-LSQ approach, the residual between the measured and modeled spectra, the wavelength dependent optical constants n and k for all the glasses studied. This work was supported by NASA PDART grant 80NSSC21K0877 to E. C. Sklute and the RISE2 SSERVI cooperative agreement 80NSSC19M0215.