{{Short description|Phyllosilicate mineral}} {{Infobox mineral | name = Sanbornite | category = Phyllosilicate minerals | boxwidth = | boxbgcolor = | image = Sanbornite with celsian.jpg | imagesize = | caption = Sanbornite (white) with celsian (gray)—Incline, Maricopa County, California | formula = Ba(Si<sub>2</sub>O<sub>5</sub>) | IMAsymbol = Sabn<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 = 273.50 g/mol | strunz = 9.EF.10 | system = Orthorhombic | class = Dipyramidal (mmm) <br/>H-M symbol: (2/m 2/m 2/m) | symmetry = ''Pmcn'' | unit cell = a = 4.62 Å, b = 7.68 Å <br/>c = 13.52 Å; Z = 4 | color = Colorless, White | habit = Platy modulated layers | twinning = | cleavage = Perfect | fracture = | tenacity = | mohs = 5 | luster = Vitreous | polish = | refractive = ''n<sub>α</sub>'' = 1.597, ''n<sub>β</sub>'' = 1.616, ''n<sub>γ</sub>'' = 1.624 | opticalprop = Biaxial (−) | birefringence = δ = 0.0270 | dispersion = Weak | pleochroism = | fluorescence= | 2V = | streak = White | gravity = 3.74 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = | references = <ref name="mindat">[http://www.mindat.org/min-3518.html Sanbornite: Sanbornite mineral information and data]</ref><ref>[http://webmineral.com/data/Sanbornite.shtml Sanbornite Mineral Data]</ref> }}
'''Sanbornite''' is a rare barium phyllosilicate mineral with formula BaSi<sub>2</sub>O<sub>5</sub>. Sanbornite is a colorless to white to pale green, platey orthorhombic mineral with Mohs hardness of 5 and a specific gravity of 3.74.
It was first described from Incline, Mariposa County, California in 1932<ref>Rogers, A.F. (1932) Sanbornite, a new barium silicate mineral from Mariposa County, California. Amer. Mineral., 17, 161–172</ref> and named for mineralogist Frank B. Sanborn (1862–1936).
==See also== *List of minerals *List of minerals named after people
==Footnotes== {{Reflist}}
==References== *[http://www.mindat.org/min-3518.html Mindat w/ locations] *[http://webmineral.com/data/Sanbornite.shtml Webmineral w/ images] *[https://web.archive.org/web/20050820035312/http://mineral.galleries.com/minerals/silicate/sanborni/sanborni.htm Mineral galleries]
Category:Barium minerals Category:Phyllosilicates Category:Orthorhombic minerals Category:Minerals in space group 62
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