Carobbiite Explained

Carobbiite
Formula:KF
Imasymbol:Crb[1]
Molweight:58.10 gm
Strunz:3.AA.20
Dana:9.1.1.4
System:Isometric - Hexoctahedral
Class:m3m (4/m 3 2/m) - Hexoctahedral
Symmetry:Cubic
Unit Cell:152.27 ų
Colour:Colorless
Cleavage:Distinct/Good
Mohs:2-2.5
Luster:Vitreous (Glassy)
Streak:White
Diaphaneity:Transparent
Gravity:2.505
Density:2.524
Opticalprop:Isotropic, n=1.362.

Carobbiite, chemical formula KF (potassium fluoride), is a rare, soft (Mohs 2 - 2.5), colourless cubic mineral.[2] 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).[3] It has also been reported from Hokkaido, Japan.[4]

References

  1. Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3. 291–320. 10.1180/mgm.2021.43. 2021MinM...85..291W. 235729616. free.
  2. http://webmineral.com/data/Carobbiite.shtml Mineral data on Carobbiite
  3. http://rruff.geo.arizona.edu/doclib/hom/carobbiite.pdf Mineral Handbook
  4. http://www.mindat.org/min-908.html Mindat