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Quantification of Fe-oxidation state in mixed valence minerals: a geochemical application of EELS

Geochemical applications of Electron Energy-Loss Spectroscopy (EELS) in the Transmission Electron Microscopy (TEM) are uncommon despite its considerable potential. EELS possesses a wide range of potential applications, including elemental quantification and the determination of oxidation state, and local co-ordination of atomic species. Of these, the determination and quantification of Fe oxidation state is of particular geochemical significance in terms of the information it provides on redox, fugacity and pressure and temperature conditions at crystallisation.