Davidite
(repeating unit)(La,Ce,Ca)(Y,U)(Ti,Fe3+
)
20O
38 IMA symbol Dvd-La[1] Strunz classification 4.CC.40 Crystal system Trigonal Crystal class Rhombohedral (3)
H-M symbol: (3) Space group R3 Unit cell a = 10.376, c = 20.91 [Å]; Z = 3 Identification Color Black Fracture Subconchoidal to uneven Tenacity Brittle Mohs scale hardness 6 [2] Luster Vitreous Diaphaneity Opaque, translucent in very thin fragments Specific gravity 4.33 to 4.48 Alters to Metamict Other characteristics
RadioactiveReferences [3][4][5][6]
)
20O
38
H-M symbol: (3)
![](http://upload.wikimedia.org/wikipedia/commons/thumb/b/b5/Radioactive.svg/25px-Radioactive.svg.png)
Davidite is a rare earth oxide mineral with chemical end members Lanthanum (La) and Cerium (Ce). It exists in two forms:
- Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe3+
)
20O
38 discovered at Radium Hill mine, South Australia in 1906 and named by Douglas Mawson for Australian geologist Tannatt William Edgeworth David (1858-1934).[7] - Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe3+
)
20O
38 first described in 1960 from Vemork, Iveland, Norway.
References
- ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
- ^ "Davidite-(La) Mineral Data".
- ^ Davidite-La in Handbook of Mineralogy
- ^ Davidite-La on Mindat
- ^ Davidite-(La) on Webmineral
- ^ Davidite-(Ce) on Webmineral
- ^ 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
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