Electron-channeling experiments using planes normal to the hexagonal c axis and planes parallel to {1011} have revealed site occupancies of minor elements in natural ilmenites and dolomites. In ilmenite, almost all of the Mg and Mn reside in the Fe site, whereas Cr shows a slight preference for the Ti site and most of the A1 occupies the Ti site. In dolomite, Mn is strongly ordered into the Mg site, whereas Fe shows only a slight preference for the Mg site. Except for the Fe in dolomite, these results are consistent with simple cationradius considerations.

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