Editing Fluorite (section)

==Source of fluorine gas in nature==
In 2012, the first source of naturally occurring fluorine gas was found in fluorite mines in Bavaria, Germany. It was previously thought that [[fluorine gas]] did not occur naturally because it is so reactive, and would rapidly react with other chemicals.<ref>[http://www.labspaces.net/121513/First_direct_evidence_that_elemental_fluorine_occurs_in_nature First direct evidence that elemental fluorine occurs in nature]. Labspaces.net (2012-07-06). Retrieved on 2013-08-05.</ref> Fluorite is normally colorless, but some varied forms found nearby look black, and are known as 'fetid fluorite' or [[antozonite]]. The minerals, containing small amounts of [[uranium]] and its daughter products, release radiation sufficiently energetic to induce oxidation of fluoride anions within the structure, to fluorine that becomes trapped inside the mineral. The color of fetid fluorite is predominantly due to the [[calcium]] atoms remaining. Solid-state fluorine-19 [[Nuclear magnetic resonance|NMR]] carried out on the gas contained in the antozonite, revealed a peak at 425&nbsp;ppm, which is consistent with F<sub>2</sub>.<ref>Withers, Neil (1 July 2012) [http://www.rsc.org/chemistryworld/2012/07/fluorine-finally-found-nature Fluorine finally found in nature |Chemistry World]. Rsc.org.</ref>