Single crystals of MnSiO3 tetragonal garnet have been grown at 1500°C and about 12.0 GPa by means of an MA8-type high-pressure apparatus. The crystal-structure analysis using single-crystal X-ray intensity data reveals that (1) the space group is I41/a with cell dimensions of a = 11.774(1) and c = 11.636(2) Å, (2) the Mn and Si atoms are fully ordered into different octahedral sites, and (3) the Si octahedron is very regular in shape with the mean Si-O distance of 1.795 Å. The structural comparison among four polymorphs of MnSiO3 is also discussed.

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