Pyrope, Mg3Al2Si3O12, being an important phase in the interior of the Earth, has been investigated many times. However, there is long-standing disagreement on the behavior of the Mg cation located in the triangular dodecahedron of the garnet crystal structure. Two interpretations have been advanced: (1) that the Mg cation has a large amplitude of thermal vibration (i.e., shows dynamic disorder or a “rattling” motion) and (2) that the Mg cation is statically disordered positionally around the special 24c Wyckoff position. Nakatsuka et al. (2011) presented X-ray single-crystal diffraction results on pyrope...

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