In this paper, mass attenuation coefficients of different granite samples are calculated at 662, 1173 and 1332 keV photon energies by using Monte Carlo code MCNPX (version 2.4.0). The obtained numerical results are compared not only with previous experimental and theoretical studies but also with standard theoretical data. The results showed that MCNPX results from generated simulation input agreed well with experimental studies and previous investigations. In addition, numerical deviation values of the mass attenuation coefficients in three photon energies has been obtained minimum between MCNPX andtheoretical data. The comaparative results underlined R-squared value for MCNPX approach out performs compared to both experiemental results and GATE model. Our results showed that, MCNPX is significantly convenient in comparison to GEANT4 for the energy range used. The results obtained from validated simulation input have been used for the calculation of some other important shielding parameter such as half value layer (HVL). It can be concluded that, standard simulation geometry would be useful for scientific community and MCNPX can be used as a powerful tool where no analogous experimental data exist for investigating shielding materials used in nuclear fields, industrial fields and high-energy radiation therapy facilities.