Edingtonite

{{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 minerals | group = Zeolite group | formula = BaAl2Si3O10·4H2O | 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 | 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 = nα = 1.538 nβ = 1.549 nγ = 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</ref><ref name=HBM/> }}

'''Edingtonite''' is a white, gray, brown, colorless, pink or yellow zeolite mineral. Its chemical formula is Ba Al2Si3O10·4H2O. It has varieties with tetragonal, orthorhombic or triclinic crystals.<ref>Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: "Dana's new mineralogy", pp. 1683-1684. John Wiley & Sons, 1997</ref>

The mineral occurs within cavities in nepheline syenites, carbonatites, in hydrothermal veins and various mafic rocks. It occurs associated with thomsonite, analcime, natrolite, harmotome, brewsterite, prehnite and calcite.<ref name=HBM/>

The mineral was first reported by and named for Scottish 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) credit Scottish geologist and mineralogist 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