Geographic Minerals



Carobbiite, chemical formula KF (potassium fluoride), is a rare, soft (Mohs 2 – 2.5), colorless cubic mineral. It consists of Potassium fluoride, a rare, soft, colorless cubic mineral. 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). It has also been reported from Hokkaido, Japan.

General information

  • Formula: KF
  • Hardness: 2 – 2½
  • Specific Gravity: 2.505
  • Crystal System: Isometric
  • Member of: Halite Group


  • Color: Colorless
  • Cleavage: Distinct/Good On {001}.
  • Density: 2.505 g/cm3 (Measured) and 2.528 g/cm3 (Calculated)

Occurrence: In stalactites in cavities in lava.

Association: Halite, mercallite, hieratite.

Distribution: On Vesuvius, Campania, Italy.


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