Sborgite
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 | |
|---|---|
| General | |
| Category | Nesoborates |
| Formula (repeating unit) | Na[B5O6(OH)4]·3H2O |
| 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 |
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.[1]
See also
References
- 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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