{{Short description|Mineral found in meteorites}} {{Infobox mineral | name = Brianite | image = Brianite.jpg | alt = | caption = Small white microcrystals of brianite from the Dayton meteorite | category = Phosphate minerals | formula = Na<sub>2</sub>CaMg(PO<sub>4</sub>)<sub>2</sub> |IMAsymbol=Bne<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 = 8.AC.30 | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''P''2<sub>1</sub>/a | unit cell = a = 13.36&nbsp;Å, b = 5.23&nbsp;Å, <br/>c = 9.13&nbsp;Å, β = 91.2°; Z&nbsp;=&nbsp;4 | color = Colorless | colour = | habit = Anhedral grains with lamellar structure visible under polarized light | twinning = Polysynthetic on {100} | cleavage = | fracture = | tenacity = | mohs = 4-5 | luster = Vitreous | streak = | diaphaneity = Transparent | gravity = 3.0-3.1 | density = | polish = | opticalprop = biaxial (-) | refractive = n<sub>α</sub> = 1.598, n<sub>β</sub> = 1.605, n<sub>γ</sub> = 1.608 | birefringence = 0.010 | pleochroism = | 2V = 63° to 65° | dispersion = | extinction = 2 to 3° from lamellae | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | prop1 = | prop1text = | references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Brianite Mineralienatlas]</ref><ref name=Mindat/><ref name=Webmin/><ref name=HBM/> }}

'''Brianite''' is a phosphate mineral with the chemical formula Na<sub>2</sub>CaMg(PO<sub>4</sub>)<sub>2</sub>.<ref name=Webmin>[http://webmineral.com/data/Brianite.shtml Brianite data on Webmin]</ref> It was first identified in an iron meteorite.<ref name=Mindat>[http://www.mindat.org/min-771.html Brianite mineral information and data on Mindat]</ref> This mineral is named after Brian Harold Mason (1917–2009), a pioneer in meteoritics.<ref name=Mindat/>

It was first reported from the Dayton meteorite in Montgomery County, Ohio in 1966.<ref name=Mindat/> It occurs in phosphate nodules within the meteorite. Associated minerals include: panethite, whitlockite, albite, enstatite, schreibersite, kamacite, taenite, graphite, sphalerite and troilite.<ref name=HBM>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/brianite.pdf |title=Brianite data from the Handbook of Mineralogy |access-date=2015-01-31 |archive-date=2015-09-24 |archive-url=https://web.archive.org/web/20150924050529/http://www.handbookofmineralogy.com/pdfs/brianite.pdf |url-status=dead }}</ref>

==See also== * Glossary of meteoritics

==References== {{reflist}}

{{Meteorites}}

Category:Phosphate minerals Category:Meteorite minerals Category:Monoclinic minerals Category:Minerals in space group 14

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