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 is colourless 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, USA. [http://rruff.geo.arizona.edu/doclib/hom/sborgite.pdf Mineral Handbook]

ee also

*List of minerals

References

*cite journal
title = Un nuovo minerale fra i prodotti boriferi di Larderello
author = Curzio Cipriani
journal = Atti Rend. Accad. Lincei
volume = 22
issue =
pages = 519–525
year = 1957
url =
doi =
*cite journal
title = The crystal structure of NaB₅O₆(OH)₄
author = S. Menchetti and C. Sabelli
journal = Acta Crystallographica Section B
volume = B34
issue =
pages = 45–49
year = 1978
url =
doi = 10.1107/S0567740878002289
*cite journal
title = The crystal structure of sborgite, NaB5O6(OH)4.3H2O
author = S. Merlino
journal = Acta Crystallographica Section B
volume = B28
issue =
pages = 3559–3567
year = 1972
url =
doi = 10.1107/S0567740872008349
* [http://www.minsocam.org/ammin/AM43/AM43_378.pdf sborgite]
* [http://webmineral.com/data/Sborgite.shtml webmineral.com]