Sborgite Explained

Sborgite
Category:	Nesoborates
Formula:	Na[B<sub>5</sub>O<sub>6</sub>(OH)<sub>4</sub>]·3H2O
Imasymbol:	Srg^[1]
Strunz:	6.EA.05
System:	Monoclinic
Class:	Prismatic (2/m) (same H-M symbol)
Symmetry:	C2/c
Color:	colorless
Luster:	vitreous
Diaphaneity:	transparent

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

• Un nuovo minerale fra i prodotti boriferi di Larderello . Curzio Cipriani . Atti Rend. Accad. Lincei . 22 . 519–525 . 1957 .
• The crystal structure of NaB₅O₆(OH)₄ . S. Menchetti and C. Sabelli . . B34 . 1. 45–49 . 1978 . 10.1107/S0567740878002289 .
• The crystal structure of sborgite, NaB5O6(OH)4.3H2O . S. Merlino . . B28 . 12. 3559–3567 . 1972 . 10.1107/S0567740872008349 .
• sborgite
• webmineral.com

Notes and References

1. Warr. L.N.. 2021. IMA–CNMNC approved mineral symbols. Mineralogical Magazine. 85. 3. 291–320. 10.1180/mgm.2021.43. 2021MinM...85..291W. 235729616. free.
2. http://rruff.geo.arizona.edu/doclib/hom/sborgite.pdf Mineral Handbook