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Cover Picture: Occurrence of Difluorine F2 in Nature—In Situ Proof and Quantification by NMR Spectroscopy (Angew. Chem. Int. Ed. 31/2012)



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The Most Reactive Element fluorine, was long thought not to occur in nature as F2. In their Communication on page 7847 ff., F. Kraus and co-workers present first direct evidence from in situ NMR spectroscopy that difluorine is included in the black fluorite “antozonite”, a mineral found close to Wölsendorf, Germany. The picture shows elemental fluorine, “antozonite” (CaF2), and the town close to where the mineral was found. (The photograph of Wölsendorf was provided by Alois Laumer.)

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