Davidite
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| Davidite-(La) | |
|---|---|
-35242.jpg) Davidite-(La) from Kazakhstan |
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| General | |
| 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.
[edit] References
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