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Keywords:

  • antozonite;
  • fluorine;
  • fluorite;
  • NMR spectroscopy
Thumbnail image of graphical abstract

The most reactive chemical element, F2, has been claimed not to occur in nature. First direct evidence from in situ NMR spectroscopy now proves that elemental F2 indeed occurs in nature as an occlusion in “antozonite” (right in the picture), a variant of fluorite (CaF2, left).