Abstract
Mössbauer spectra have been measured at room temperature on synthetic samples along the join CaMgSi2O6-CaFeSi206 and the join Ca0.8Mg1.2Si2O6-CaO.8Fe1.2Si206, as well as on natural samples including ferrosalites, augites, and subcalcic augite. Only those samples of which compositions lie upon the Di-Hd join gave simple spectra. Substitution of the types Ca-(Mg, Fe2+) and (Mg, Fe2+)-(Fe3+, Al) makes the spectrum complex, so that the observed curve cannot be analyzed in terms of two doublets for Fe2+, even when we cannot expect more than two sets of nonequivalent positions for Fe2+ from X-ray crystallographic data.
