Mercuryselenide is a zero-gap semiconductor of Ⅱ-Ⅵ-family. The iron-doped modification HgSe:Fe has a “Fermi-level pinning” beyond the electron concentration of 5×10 18 cm -3 . Due to the short-range correlation of Fe ++ /Fe +++ -system, a dramatic increase of carrier mobility is observed, so that any quantum effect in 3D, 2D, 1D, and 0D is well detected. Applying molecular-beam epitaxy for the sample preparation, we present magnetospectral data of selected samples of this compound demonstrating various features in magnetic fields up to 1000 T by applying different field generators. The resulting data are explained in connection with suitable theoretical concepts basing on the k *p-method as well as on the tight-binding approximation.