Sborgite

(repeating unit)Na[B5O6(OH)4]·3H2OIMA symbolSrg[1]Strunz classification6.EA.05Crystal systemMonoclinicCrystal classPrismatic (2/m)
(same H-M symbol)Space groupC2/cIdentificationColorcolorlessLustervitreousDiaphaneitytransparent

Sborgite is a sodium borate mineral with formula Na[B5O6(OH)4]·3H2O. The formula can be written as the oxide formulation, Na2O.5B2O3.10H2O. Sometimes called sodium pentaborate pentahydrate it contains the pentaborate anion, (B5O6(OH)4)−.

Sborgite is colorless with monoclinic crystals. It was named for Umberto Sborgi, (1883–1955), Professor of Chemistry, University of Milan, Italy. Sborgite occurs in Tuscany, Italy and the Furnace Creek district, Death Valley, California, US.[2]

See also

  • List of minerals

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. ^ http://rruff.geo.arizona.edu/doclib/hom/sborgite.pdf Mineral Handbook
  • Curzio Cipriani (1957). "Un nuovo minerale fra i prodotti boriferi di Larderello". Atti Rend. Accad. Lincei. 22: 519–525.
  • S. Menchetti and C. Sabelli (1978). "The crystal structure of NaB5O6(OH)4". Acta Crystallographica Section B. B34 (1): 45–49. doi:10.1107/S0567740878002289.
  • S. Merlino (1972). "The crystal structure of sborgite, NaB5O6(OH)4.3H2O". Acta Crystallographica Section B. B28 (12): 3559–3567. doi:10.1107/S0567740872008349.
  • sborgite
  • webmineral.com


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