Wyartite
A variety of Minerals
What is Wyartite?
Wyartite CaU(UO2)2(CO3)O4(OH)·7H2O is a uranium bearing mineral named after Jean Wyart (1902–1992), mineralogist at the Sorbonne, Paris. It has greenish-black, black, or violet-black, translucent to opaque orthorhombic crystals. A hardness of 3 - 4 Mohs. Its other names are Ianthinite (of Bignand), Wyartit and Wyartita. It belongs to the uranium carbonate group of minerals. It is found next to rutherfordine in Shinkolobwe, Shaba, Zaire. Determination of the structure of wyartite provided the first evidence for a pentavalent uranium mineral. Like all uranium minerals it is radioactive.
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Quick Facts
Physical Properties
- Color
- Black, violet-black (fresh); yellowish brown, greenish brown (exposed)
- Hardness (Mohs)
- 3 - 4
- Density
- 4.69 g/cm³
- Streak
- brownish-violet
Chemical Properties
- Chemical Formula
- CaU5+(UO2)2(CO3)O4(OH) · 7H2O
- Elements
- C, Ca, H, O, U
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