Ga1.4Ge2.86Mn3.6O12Si0.14 (1), cubic, Ia3d (No. 230), a = 12.043(3) Angstrom, V = 1746.6 Angstrom(3), Z = 8, R-gt(F) = 0.028, wR(ref)(F-2) = 0.062, T = 300 K. Ga1.56Ge3Mn3.44O12 (2), cubic, Ia3d (No. 230), a = 12.049(3) Angstrom, V = 1749.3 Angstrom(3), Z = 8, R-gt(F) = 0.023, wR(ref)(F-2) = 0.052, T = 300 K. Ga0.7Ge0.4Mn6.3O12Si0.6 (3), tetragonal, I4(1)/acd (No. 142), a = 9.464(4) Angstrom, c = 18.78(3) Angstrom, V = 1682.1 Angstrom(3), Z = 8, R-gt(F) = 0.023, wR(ref)(F-2) = 0.053, T = 300 K.
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