FE-57 MOSSBAUER-SPECTROSCOPY ON 2 ROMANIAN CARPATHIAN PUMPELLYITES

The authors obtained the Fe-57 Mossbauer spectra of two pumpellyite sa mples obtained from two different mineral sources in the Romanian Carp athians. Using a specialized computation program of the quadrupole spl itting spectral parameter, QSCOMP, the observed quadrupole doublets we re attributed to the ferric and ferrous ions in octahedral sites. The refined analysis of spectral parameters permitted us to characterize b oth the oxidation state, the electronic configuration and the coordina tion symmetry with the distortions and occupancies of pumpellyite cons tituting iron ions. The differences of the spectral parameters giving the data of the iron abundance, the chemical iron-oxygen bonds, the de formation and occupancies of iron octahedra, observed at the two studi ed samples, are discussed and correlated by the different genesis cond itions of two pumpellyite-bearing occurrences.