[en] An appearance of Bragg maxima in the Moessbauer diffraction pattern due to a combined hyperfine interaction on nuclei in a crystal is discussed. By a combined interaction one means presence on the nuclei of a magnetic field and tensor of electric field gradient. The structure RFe₂ R=Pu, Np, V, Zr, Tm) is considered. It has been shown that when a scattering system is in fields of several actions with various symmetries, the diffraction pattern is not an additive superposition of diffraction patterns of magnetic and electric quadrupole scatterings. In this case the diffraction patterns of magnetic and electric quadrupole scatterings. In this case the diffraction spectra have maxima forbidden by the extinction laws in diffraction in the presence of only a magnetic field or only electric quadrupole interaction