Carobbiite
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]
| Carobbiite | |
|---|---|
 Carobbiite | |
| General | |
| Category | Mineral |
| Formula (repeating unit) | KF |
| IMA symbol | Crb[1] |
| Strunz classification | 3.AA.20 |
| Dana classification | 9.1.1.4 |
| Crystal system | Isometric - Hexoctahedral |
| Crystal class | m3m (4/m 3 2/m) - Hexoctahedral |
| Space group | Cubic |
| Unit cell | 152.27 ų |
| Identification | |
| Formula mass | 58.10 gm |
| Colour | Colorless |
| Cleavage | Distinct/Good |
| Mohs scale hardness | 2-2.5 |
| Luster | Vitreous (Glassy) |
| Streak | White |
| Diaphaneity | Transparent |
| Specific gravity | 2.505 |
| Density | 2.524 |
| Optical properties | Isotropic, n=1.362. |
References
- Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- http://webmineral.com/data/Carobbiite.shtml Mineral data on Carobbiite
- http://rruff.geo.arizona.edu/doclib/hom/carobbiite.pdf Mineral Handbook
- http://www.mindat.org/min-908.html Mindat
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