- Davidite
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Davidite-(La) 
Davidite-(La) from KazakhstanGeneral Category Oxide minerals Chemical formula (La,Ce,Ca)(Y,U)(Ti,Fe3+)20O38 Strunz classification 04.CC.40 Crystal symmetry Trigonal rhombohedral (3) Unit cell a = 10.376 Å, c = 20.91 Å; Z = 3 Identification Color Black Crystal system Trigonal Fracture Subconchoidal to uneven Tenacity Brittle Mohs scale hardness ~6 Luster Vitreous Diaphaneity Opaque, translucent in very thin fragments Specific gravity 4.33 to 4.48 Alters to Metamict References [1][2][3][4] Davidite is a rare earth oxide mineral with chemical end members La and Ce. It exists in two forms:
- Davidite-(La) (La,Ce,Ca)(Y,U)(Ti,Fe3+)20O38 discovered at Radium Hill mine, South Australia in 1906 and named for Australian geologist Tenatt William Edgeworth David (1858-1934).
- Davidite-(Ce) (Ce,La)(Y,U)(Ti,Fe3+)20O38 first described in 1960 from Vemork, Iveland, Norway.
References
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