# Edingtonite

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{{Short description|Zeolite mineral}}
{{Infobox mineral
| name        = Edingtonite
| image       = Edingtonite-120476.jpg
| imagesize   = 260px
| alt         = 
| caption     = Edingtonite from Ice River Alkaline Complex, Golden Mining Division, British Columbia, Canada
| category = [Tectosilicate](/source/Tectosilicate) minerals
| group = [Zeolite](/source/Zeolite) group
| formula     = BaAl<sub>2</sub>Si<sub>3</sub>O<sub>10</sub>·4H<sub>2</sub>O
| IMAsymbol   = Edi<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>
| strunz      = 9.GA.15
| symmetry    = 
| unit cell   = 
| molweight   = 
| color       = White, gray, pink
| colour      = 
| habit       = Prismatic pseudotetragonal crystals; massive.
| system      = [Orthorhombic](/source/Orthorhombic_crystal_system)
| twinning    = On [110] and [001]
| cleavage    = Perfect on [110]
| fracture    = 
| tenacity    = 
| mohs        = 4 - 4.5
| luster      = 
| streak      = 
| diaphaneity = 
| gravity     = 2.73 - 2.78
| density     = 
| polish      = 
| opticalprop = Biaxial (-)
| refractive  = n<sub>α</sub> = 1.538 n<sub>β</sub> = 1.549 n<sub>γ</sub> = 1.554
| birefringence = δ = 0.016
| pleochroism = 
| 2V          = 54 - 62°
| dispersion  = r < v; strong
| extinction  = 
| length fast/slow =
| fluorescence = 
| absorption  = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| impurities  = 
| alteration  = 
| other       = Pyroelectric and piezoelectric
| prop1       = 
| prop1text   = 
| references  = <ref name=Webmin>[http://www.webmineral.com/data/Edingtonite.shtml Edingtonite mineral data from Webmineral]</ref><ref name=Mindat>[http://www.mindat.org/min-1353.html Edingtonite mineral data] from [Mindat.org](/source/Mindat.org)</ref><ref name=HBM/>
}}

'''Edingtonite''' is a white, gray, brown, colorless, pink or yellow [zeolite](/source/zeolite) [mineral](/source/mineral). Its [chemical formula](/source/chemical_formula) is [Ba](/source/Barium)[Al](/source/Aluminium)<sub>2</sub>[Si](/source/Silicon)<sub>3</sub>[O](/source/Oxygen)<sub>10</sub>·4[H<sub>2</sub>O](/source/water). It has varieties with [tetragonal](/source/tetragonal_crystal_system), [orthorhombic](/source/orthorhombic_crystal_system) or [triclinic](/source/triclinic_crystal_system) crystals.<ref>Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: "[Dana](/source/James_Dwight_Dana)'s new mineralogy", pp. 1683-1684. John Wiley & Sons, 1997</ref>

The mineral occurs within cavities in [nepheline syenite](/source/nepheline_syenite)s, [carbonatite](/source/carbonatite)s, in
[hydrothermal vein](/source/hydrothermal_vein)s and various [mafic](/source/mafic) rocks. It occurs associated with [thomsonite](/source/thomsonite), [analcime](/source/analcime), [natrolite](/source/natrolite), [harmotome](/source/harmotome), [brewsterite](/source/brewsterite), [prehnite](/source/prehnite) and [calcite](/source/calcite).<ref name=HBM/>

The mineral was first reported by and named for Scottish [mineral collector](/source/mineral_collector) James Edington (1787–1844).<ref name=Mindat/><ref name=HBM>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/edingtonite.pdf |title=Handbook of Mineralogy |access-date=2019-05-08 |archive-date=2019-05-08 |archive-url=https://web.archive.org/web/20190508113852/http://www.handbookofmineralogy.com/pdfs/edingtonite.pdf |url-status=dead }}</ref> Other sources (including the mineralogist [Haidinger](/source/Wilhelm_Karl_Ritter_von_Haidinger)) credit Scottish geologist and mineralogist [Thomas Edington](/source/Thomas_Edington) (1814-1859).<ref>{{cite book|title=Biographical Index of Former Fellows of the Royal Society of Edinburgh 1783–2002|date=July 2006|publisher=The Royal Society of Edinburgh|isbn=0-902-198-84-X|url=https://www.royalsoced.org.uk/cms/files/fellows/biographical_index/fells_indexp1.pdf|access-date=2016-04-04|archive-date=2013-01-24|archive-url=https://web.archive.org/web/20130124115814/http://www.royalsoced.org.uk/cms/files/fellows/biographical_index/fells_indexp1.pdf|url-status=dead}}</ref> However, as the mineral was named in 1825, the former accreditation must be the true one.<ref>Wilhelm Karl von Haidinger, "Description of Edingtonite, a New Mineral Species", in ''The Edinburgh Journal of Science'', V. iii, October 1825, [https://books.google.com/books?id=2SAAAAAAMAAJ&pg=PA316 pp. 316–320]</ref>

==References==
{{reflist}}

==External links==
{{commons category-inline|Edingtonite}}
*[http://helios.princeton.edu/zeomics/cgi-bin/view_structure.pl?src=iza&id=EDI Edingtonite structure]{{Dead link|date=August 2025 |bot=InternetArchiveBot |fix-attempted=yes }}

Category:Zeolite group
Category:Barium minerals
Category:Tetrahydrate minerals

{{silicate-mineral-stub}}

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Adapted from the Wikipedia article [Edingtonite](https://en.wikipedia.org/wiki/Edingtonite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Edingtonite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.