{{Short description|Iron-magnesium sulfide mineral}} {{Infobox mineral | name = Keilite | image = | imagesize = | alt = | caption = | category = Sulfides | formula = {{chem2|(Fe(2+),Mg)S}} | IMAsymbol = Ke<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 = 81.91 gm | strunz = 2/C.15-15 | dana = 2.8.1.9 | system = Isometric | class = Hexoctahedral | symmetry = ''Fm{{overline|3}}m'' (No. 225) | unit cell = a = 5.1717(18)Å | color = | colour = Grey | habit = Microscopic crystals | twinning = | cleavage = Distinct/good | fracture = | tenacity = Brittle | toughness = | mohs = | luster = Metallic | streak = | diaphaneity = Opaque | gravity = 3.958 | density = 3.958 | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | Curie temp = | fusibility = | diagnostic = | solubility = | impurities = | alteration = }} '''Keilite''' is an iron-magnesium sulfide mineral with the chemical formula {{chem2|(Fe,Mg)S)}} that is found in enstatite chondrites.<ref>{{Cite web|last=|first=|date=|title=Keilite Mineral Data|url=https://webmineral.com/data/Keilite.shtml|archive-url=|archive-date=|access-date=15 February 2021|website=WebMineral}}</ref> Keilite is the iron-dominant analog of niningerite.<ref name=":0">{{Cite web|last=|first=|date=|title=Keilite|url=http://www.handbookofmineralogy.com/pdfs/Keilite.pdf|url-status=dead|archive-url=https://web.archive.org/web/20160303171359/http://www.handbookofmineralogy.com/pdfs/keilite.pdf|archive-date=3 March 2016|access-date=15 February 2021|website=Handbook of Mineralogy}}</ref><ref name=":1">{{Cite journal|vauthors=Shimizu M, Yoshida H, Mandarino JA|title=The New Mineral Species Keilite, (Fe,Mg)S, The Iron-Dominant Analogue of Niningerite|url=https://rruff.info/doclib/cm/vol40/CM40_1687.pdf|journal=The Canadian Mineralogist|year=2002|volume=40|issue=6|pages=1687–1692|doi=10.2113/gscanmin.40.6.1687|bibcode=2002CaMin..40.1687S |s2cid=93381076 |via=}}</ref> Keilite is named after Klaus Keil (born 1934).<ref name=":0" />
==Occurrences== Examples of keilite occurrences are enstatite chondrites and the Zakłodzie meteorite.<ref name=":1" /> It appears to be confined to impact-melt influenced enstatite chondrites that were quenched. There are also some meteorites interpreted as impact-melt breccias that do not contain keilite. This is explained as a deeper burial after impact, which slowed cooling and enabled retrograde reactions (diapthoresis) to take place.<ref name="Keil 2007">{{cite journal|last=Keil|first=Klaus|title=Occurrence and origin of keilite, (Fe>0.5,Mg<0.5)S, in enstatite chondrite impact-melt rocks and impact-melt breccias|journal=Chemie der Erde - Geochemistry|date=30 April 2007|volume=67|issue=1|pages=37–54|doi=10.1016/j.chemer.2006.05.002|bibcode=2007ChEG...67...37K}}</ref>
==References== {{Reflist}}
{{meteorites}}
Category:Galena group Category:Iron(II) minerals Category:Magnesium minerals Category:Cubic minerals Category:Minerals in space group 225
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