Fluorescence of Fluorite and the Bivalent Europium Ion

@article{Przibram1935FluorescenceOF,
  title={Fluorescence of Fluorite and the Bivalent Europium Ion},
  author={Karl b. Przibram},
  journal={Nature},
  year={1935},
  volume={135},
  pages={100-100}
}
EXPERIMENTS conducted in this Institute1 had led to the conclusion that the blue fluorescence of fluorite excited by filtered ultra-violet light is due to traces of europium under the influence of radioactive substances, and that a yellow-green fluorescence which some fluorites show at the temperature of liquid air—especially those from acid magmatic rocks—is, in the same way, due to ytterbium. As these rare earths are those most readily obtained in the bivalent form2, as further the reducing… 
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