Chemical Composition of Meteorites

MnO / Fe₂O₃(T)

The ratio of manganese to iron does not vary much within different groups of meteorites.
The MnO/Fe₂O₃(T) ratio (or Fe/Mn or FeO/MnO) is not as reliable a test for meteorites as some sources imply, although ratios of <60 are inconsistent with lunaites and >50 are inconsistent with eucrites, for example.

See Notes, Caveats, and References