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inorganic compounds
A new model of MnSiF6.6H2O is presented which reproduces the `weak' h0l reflections not explained with the `antiphase domain' model by Chevrier [Acta Cryst. (1991), B47, 224-228]. Good agreement for the `weak' reflections was obtained by assuming a sort of submicroscopic twinning. The average distances are Mn-O 2.15, Si-F 1.69 and OF 2.78 Å.