The compound NaMnFe(PO 4 ) 2 is predicted as a kind of olivine structure, but the diffraction pattern is not well fitted by this model, and resembles more closely an Alluaudite phase, an orthophosphate structure, of which many compounds are known containing Na,Mn,Fe metals in different proportions, which are included in the ICSD. We consider this the more likely identity of the material.