Note on the 57Fe mössbauer spectroscopy of oriented paramagnetic minerals

The theoretical variation law for the (saturation-free) intensity ratio of a paramagnetic doublet is written in a way which allows one to check easily whether or not experimental data which are intended to be fitted by a (saturation-free) theoretical spectrum or subspectrum follow actually this law. The expression of this law is still simplified by taking the absorber symmetries into account. This is illustrated by two examples: a sheet-silicate mosaic and an olivine single-crystal.