The Scacchi's “fluosiderite” was first collected more than a century ago from thermally metamorphosed dolomitic limestones at the Fiano quarry (southern Italy). It was considered as a new species but only partially described, owing to the small size of the crystals and the fine intergrowths of other minerals. For this work we have considered both our samples and one specimen from the collection of the Royal Mineralogical Museum of the University of Naples. Chemical and X-ray diffraction analyses have re-identified this unknown mineral as a fluorine-rich chondrodite. The genesis of this particular mineral assemblage is related to the emplacement of hot and volatile (mainly fluorine) -rich Campanian Ignimbrite.

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