Geiger (2013) argues that the large mean square displacement (MSD) of Mg in the dodecahedral site in pyrope, Mg3Al2Si3O12, originates from the dynamic disorder of Mg due to its large anisotropic thermal vibration, including anharmonic contribution, and refutes our findings that the Mg static disorder is present. His argument is based on the diffraction, spectroscopic, thermodynamic, and computational studies made mainly by him and his co-workers. However, these investigations only suggested the large anisotropy of the Mg thermal vibration, and do not necessarily prove that there is no Mg static disorder. What we must obtain is conclusive experimental proof as to whether the Mg static disorder exists or not. In the present paper, a reply to his comment (Geiger 2013), we discuss the validity of our findings (Nakatsuka et al. 2011). A “direct” method to confirm the Mg static disorder is to observe a splitting of electron density maxima around the Mg site form the structure analysis. As shown in Nakatsuka et al. (2011), we successfully observed the residual electron density maxima around the Mg site (24 c site) in the difference Fourier map at a low temperature of 97 K. In addition, the refinements assigning Mg to these electron density maxima (split-atom model refinements) yielded “the Mg positional parameters deviating significantly from the 24 c site” and provided “the atomic displacement parameters (ADPs) of Mg significantly smaller than the ones in the normal-model refinements,” assigning Mg to the 24 c site, as a consequent of the removal of the static disorder components. These are direct evidence for the presence of the Mg static disorder. In the anharmonic refinements, several of the higher-rank tensor coefficients of Mg, Al, Si, and O atoms deviated significantly from …