Carobbiite
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Carobbiite, chemical formula KF (potassium fluoride), is a rare, soft (Mohs 2 - 2.5), colorless cubic mineral.¹ It is found at Monte Somma, Somma-Vesuvius Complex, Province of Naples, Campania, Italy. It was discovered in 1956 by Italian geologist Guido Carobbi (1900–1983).² It has also been reported from Hokkaidō, Japan.³

References

1. ^ http://webmineral.com/data/Carobbiite.shtml Mineral data on Carobbiite
2. ^ http://rruff.geo.arizona.edu/doclib/hom/carobbiite.pdf Mineral Handbook
3. ^ http://www.mindat.org/min-908.html Mindat

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