Carobbiite

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Carobbiite
General
CategoryMineral
Formula
(repeating unit)
KF
IMA symbolCrb[1]
Strunz classification3.AA.20
Dana classification9.1.1.4
Crystal systemIsometric - Hexoctahedral
Crystal classm3m (4/m 3 2/m) - Hexoctahedral
Space groupCubic
Unit cell152.27 ų
Identification
Formula mass58.10 gm
ColourColorless
CleavageDistinct/Good
Mohs scale hardness2-2.5
LusterVitreous (Glassy)
StreakWhite
DiaphaneityTransparent
Specific gravity2.505
Density2.524
Optical propertiesIsotropic, 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: 291–320.
  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
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