Barrerite

Zeolite mineral
(repeating unit)(Na,K,Ca)2Al2Si7O18·6(H2O)IMA symbolBre[1]Strunz classification9.GE.15Crystal systemOrthorhombicCrystal classDipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)Space groupAmmaIdentificationColorWhite, pinkCleavagePerfectMohs scale hardness3 - 4LusterVitreous-glassyStreakWhiteDiaphaneityTransparent to translucentSpecific gravity2.13Optical propertiesBiaxial (-)Refractive indexnα = 1.479 nβ = 1.485 nγ = 1.489References[2][3][4]

Barrerite is a tectosilicate mineral and a member of the zeolite family. It is one of the rarer zeolites. It was named for Richard Barrer, a New Zealand-born chemist.[4]

Barrerite crystal are white to pinkish, with a vitreous-glassy luster. The crystal system is orthorhombic and is flat and tabular in appearance. It has a Mohs hardness of 3 to 4 and its cleavage is perfect. Barrerite has a white streak and a density of 2.13.

It was first described in 1974 for an occurrence in Sardinia at Sant' Efisio Tower on Cape Pula in Cagliari Province.[4] It has also been reported from Rocky Pass, Kuiu Island, Alaska, and a few other localities.

References

  1. ^ 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.
  2. ^ "Mineralienatlas - Fossilienatlas". www.mineralienatlas.de. Retrieved 2023-06-29.
  3. ^ "Barrerite Mineral Data". webmineral.com. Retrieved 2023-06-29.
  4. ^ a b c "Barrerite".
Wikimedia Commons has media related to Barrerite.


  • v
  • t
  • e