After fitting Mossbauer spectra for Fe(II)-silicate heated at air to 700degC, I observed uncommon, very high quadrupole splitting parameters for Fe3+, I suspect in very disordered environment (?). When for minerals (silicates) so very high QS : ~2.16 mm/s for Fe3+ can be observed (IS = 0.5 mm/s) ?? What structural constraints could this influence?