The technique of Mössbauer spectroscopy is celebrating its fiftieth year since Rudolf Mössbauer’s seminal paper (1958) that 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 including minerals. Technology and methodology in 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 that can routinely acquire...

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