Sborgite

{{Short description|Mineral}} {{Infobox mineral | name = Sborgite | boxwidth = | boxbgcolor = | image = Sborgite.jpg | imagesize = | alt = | caption = | category = Nesoborates | formula = Na[B₅O₆(OH)₄]·3H₂O | IMAsymbol = Srg<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref> | molweight = | strunz = 6.EA.05 | dana = | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''C2/c'' | unit cell = | color = colorless | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = vitreous | streak = | diaphaneity = transparent | gravity = | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = }}

'''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)^{<nowiki>&minus;</nowiki>}.

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.<ref>http://rruff.geo.arizona.edu/doclib/hom/sborgite.pdf Mineral Handbook</ref>

==See also== *List of minerals

==References== {{reflist}} *{{cite journal | title = Un nuovo minerale fra i prodotti boriferi di Larderello | author = Curzio Cipriani | journal = Atti Rend. Accad. Lincei | volume = 22 | pages = 519–525 | year = 1957 }} *{{cite journal | title = The crystal structure of NaB₅O₆(OH)₄ | author = S. Menchetti and C. Sabelli | journal = Acta Crystallographica Section B | volume = B34 | issue = 1| pages = 45–49 | year = 1978 | doi = 10.1107/S0567740878002289 | bibcode = 1978AcCrB..34...45M }} *{{cite journal | title = The crystal structure of sborgite, NaB5O6(OH)4.3H2O | author = S. Merlino | journal = Acta Crystallographica Section B | volume = B28 | issue = 12| pages = 3559–3567 | year = 1972 | doi = 10.1107/S0567740872008349 | bibcode = 1972AcCrB..28.3559M }} *[http://www.minsocam.org/ammin/AM43/AM43_378.pdf sborgite] * [http://webmineral.com/data/Sborgite.shtml webmineral.com]

{{mineral-stub}}

Category:Sodium minerals Category:Nesoborates Category:Monoclinic minerals Category:Minerals in space group 15