Tags: Chemical Substance, Mineral.
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.