The technique of Mössbauer spectroscopy is celebrating its 50th year since Rudolf Mössbauer’s seminal paper (1958), which subsequently yielded him the Nobel Prize in 1961. Mössbauer spectroscopy has long shared with wet chemistry the distinction of being a gold standard for determinations of Fe3+ and Fe2+ in solid materials, including a host of geological materials, especially minerals. The technology and methodology of this discipline have changed rapidly over the past two decades, including such advances as the development of the milliprobe Mössbauer (McCammon, 1994; Sobolev et al., 1999) and the development of spectrometers...

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