It is shown that the Mössbauer magnetic hfs spectra of a superparamagnetic particle are cardinally affected by the rotation of its magnetic moment about the magnetic anisotropy field. This rotation renormalizes the nuclear g factors and qualitatively transforms the spectra. In particular, apart from the well-known magnetic sextet, five, four, three, and even two (magnetic "doublet") lines can arise in the [SUP57]Fe absorption spectra.