Sborgite
(repeating unit)Na[B5O6(OH)4]·3H2O IMA symbol Srg[1] Strunz classification 6.EA.05 Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group C2/c Identification Color colorless Luster vitreous Diaphaneity transparent
(same H-M symbol)
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
- 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
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