The chemical formula of mineral Carobbiite is indicated by KF. This mineral Carobbiite is considered as stalactites in cavities in lava. Carobbiite is usually found at its type of locality at Vesuvius, Campania, Italy. Mineral Carobbiite was named for Guido Carobbi (1900-1983), Italian geologist, Institute of Mineralogy and Geochemistry, University of Florence, Florence, Italy, who collected the first specimens. Carobbiite is known to crystallize in the isometric system of crystal formation. In optical mineralogy, this isometric crystal system comprises crystals having three axes, all of which are perpendicular to one another and all are found equal in lengths. Mineral Carobbiite is usually found showing good cleavage in one direction which can be noticed more clearly visible under polarizing microscopes used in the field of optical mineralogy. Carobbiite is usually found colorless in hand sample. This mineral Carobbiite is commonly found showing 2.524 grams per cubic centimeters as its density measure. Most crystals of mineral Carobbiite are found transparent in appearance. The hardness measure of mineral Carobbiite is usually found ranging from 2 to 2.5 when evaluated using the Mohs scale method. Carobbiite is usually found showing vitreous or glassy luster when evaluated in reflected light of polarizing microscopes. Carobbiite is usually found leaving white streak when rubbed on whie porcelain streak plate. Carobbiite is usually found isotropic in appearance. Mineral Carobbiite is also found with mild radioactivity.