{{Short description|Mineral containing rare earth metals}} {{For|the religious sect also known as "Davidites"|The Children of Peace}} {{use dmy dates|date=June 2025}} {{Infobox mineral | name = Davidite-(La) | boxwidth = | boxbgcolor = | image = Davidite-(La)-35242.jpg | imagesize = | alt = | caption = Davidite-(La) from Kazakhstan | category = Oxide minerals | formula = {{chem|(La|,Ce|,Ca)|(Y|,U)|(Ti|,Fe|3+|)|20|O|38}} | IMAsymbol = Dvd-La<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 = 4.CC.40 | dana = | system = Trigonal | class = Rhombohedral ({{overline|3}}) <br/>H-M symbol: ({{overline|3}}) | symmetry = ''R''{{overline|3}} | unit cell = a = 10.376, c = 20.91 [Å]; Z = 3 | color = Black | colour = | habit = | twinning = | cleavage = | fracture = Subconchoidal to uneven | tenacity = Brittle | mohs = 6 <ref>{{Cite web|url=http://www.webmineral.com/data/Davidite-(La).shtml#.XAWfQnWYVhE|title=Davidite-(La) Mineral Data}}</ref> | luster = Vitreous | streak = | diaphaneity = Opaque, translucent in very thin fragments | gravity = 4.33 to 4.48 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = Metamict | other = 25px Radioactive | prop1 = | prop1text = | references = <ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/daviditela.pdf Davidite-La in Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-1234.html Davidite-La on Mindat]</ref><ref>[http://webmineral.com/data/Davidite-(La).shtml Davidite-(La) on Webmineral]</ref><ref>[http://webmineral.com/data/Davidite-(Ce).shtml Davidite-(Ce) on Webmineral]</ref> }} '''Davidite''' is a rare earth oxide mineral with chemical end members Lanthanum (La) and Cerium (Ce). It exists in two forms: *Davidite-(La) {{chem|(La|,Ce|,Ca)|(Y|,U)|(Ti|,Fe|3+|)|20|O|38}} discovered at Radium Hill mine, South Australia in 1906 and named by Douglas Mawson for Australian geologist Tannatt William Edgeworth David (1858-1934).<ref>Branagan, D.F. (2005): ''T.W. Edgeworth David: A Life: Geologist, Adventurer and "Knight in the Old Brown Hat"'', National Library of Australia, Canberra, p. 471. {{ISBN|0 642 10791 2}} </ref><ref name=branagan2007>{{cite journal| url=https://royalsoc.org.au/images/pdf/journal/140_Branagan.pdf| archive-url=https://web.archive.org/web/20170329015831/http://royalsoc.org.au/images/pdf/journal/140_Branagan.pdf| archive-date= 29 March 2017| journal= Journal and Proceedings of the Royal Society of New South Wales| volume= 140| p= 1–9|date= 2007|ISSN= 0035-9173|series=/07/01001–9|title=Davidite and other early events in Australia's uranium story| first= David |last=Branagan}}</ref> *Davidite-(Ce) {{chem|(Ce|,La)|(Y|,U)|(Ti|,Fe|3+|)|20|O|38}} first described in 1960 from Vemork, Iveland, Norway.
==References== {{Reflist}}
Category:Uranium minerals Category:Trigonal minerals Category:Minerals in space group 148
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