| Wyartite | |
|---|---|
| General | |
| Category | Carbonate minerals |
| Formula | CaU5+ (UO 2) 2(CO 3)O 4(OH)·7H2O |
| IMA symbol | Wya[1] |
| Strunz classification | 5.EA.15 |
| Crystal system | Orthorhombic |
| Crystal class | Disphenoidal (222) Space group: (222) |
| Space group | P212121 |
| Identification | |
| Color | black, violet-black (fresh); yellowish brown, greenish brown (exposed) |
| Luster | vitreous, sub-metallic, dull |
| Diaphaneity | transparent, translucent, opaque |
| Other characteristics |  Radioactive |
| References | [2][3] |
WyartiteCaU5+
(UO
2)
2(CO
3)O
4(OH)·7H2O is auranium bearingmineral named afterJean Wyart (1902–1992), mineralogist at theSorbonne,Paris. It has greenish-black, black, or violet-black, translucent to opaque orthorhombic crystals.[4] It has a hardness of 3 to 4 on theMohs scale. Its other names areianthinite (of Bignand), wyartit and wyartita. It belongs to theuranium carbonate group of minerals. It is found next torutherfordine inShinkolobwe,Shaba,Zaire.[4]
Determination of the structure of wyartite provided the first evidence for apentavalent uranium mineral. Like all uranium minerals it isradioactive.[citation needed]
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