davidite

{{For|the religious sect also known as "Davidites"|The Children of Peace}}

{{Infobox mineral

| name = Davidite-(La)

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| image = Davidite-(La)-35242.jpg

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| caption = Davidite-(La) from Kazakhstan

| category = Oxide minerals

| formula = {{chem|(La|,Ce|,Ca)|(Y|,U)|(Ti|,Fe|3+|)|20|O|38}}

| IMAsymbol = Dvd-La{{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}}

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| strunz = 4.CC.40

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| system = Trigonal

| class = Rhombohedral ({{overline|3}})
H-M symbol: ({{overline|3}})

| symmetry = R{{overline|3}}

| unit cell = a = 10.376, c = 20.91 [Å]; Z = 3

| color = Black

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| fracture = Subconchoidal to uneven

| tenacity = Brittle

| mohs = 6 {{Cite web|url=http://www.webmineral.com/data/Davidite-(La).shtml#.XAWfQnWYVhE|title=Davidite-(La) Mineral Data}}

| luster = Vitreous

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| diaphaneity = Opaque, translucent in very thin fragments

| gravity = 4.33 to 4.48

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| alteration = Metamict

| other = 25px Radioactive

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| references = [http://rruff.geo.arizona.edu/doclib/hom/daviditela.pdf Davidite-La in Handbook of Mineralogy][http://www.mindat.org/min-1234.html Davidite-La on Mindat][http://webmineral.com/data/Davidite-(La).shtml Davidite-(La) on Webmineral][http://webmineral.com/data/Davidite-(Ce).shtml Davidite-(Ce) on Webmineral]

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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).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}}
• Davidite-(Ce) {{chem|(Ce|,La)|(Y|,U)|(Ti|,Fe|3+|)|20|O|38}} first described in 1960 from Vemork, Iveland, Norway.