Color mechanisms in spinel. A multi-analytical investigation of natural crystals with a wide range of coloration
Twenty natural spinel single crystals displaying colors almost representative for the entire spinel variability were investigated by electron microprobe and UV–VIS–NIR–MIR and FTIR spectroscopies. Eight of them, selected among the Fe-bearing ones, were also analyzed by X-ray diffraction, and five by Mössbauer spectroscopy to obtain information on the oxidation state and site distribution of Fe.