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The crystal structure of seidozerite was refined (a Siemens P4 diffractometer, MoKalpha radiation, It 80 independent reflections, anisotropic refinement, R = 0.053). The monoclinic unit-cell parameters are a = 5.627(1) Å, b = 7.134(1) Å, c = 18.590(4) Å, beta = 102.68(1)°, sp. gr. P2/c, Z = 4. The structural formula, Na1.6Ca0.275Mn0.425Ti0.575Zr0.925[Si2O7]OF, agrees well with the results of the electron probe analysis. Seidozerite is demonstrated to belong to the meroplesiotype polysomatic series including the structures of more than 30 titano- and zirconosilicates

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