Davidite
| Davidite-(La) | |
|---|---|
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Davidite-(La) from Kazakhstan
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| General | |
| Category | Oxide minerals |
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Formula (repeating unit) |
(La,Ce,Ca)(Y,U)(Ti,Fe3+)20O38 |
| 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 |
| Luster | Vitreous |
| Diaphaneity | Opaque, translucent in very thin fragments |
| Specific gravity | 4.33 to 4.48 |
| Alters to | Metamict |
| References | |
Davidite is a rare earth oxide mineral with chemical end members La and Ce. It exists in two forms:
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