Wyartite

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Wyartite
General
Category Carbonate minerals
Formula
(repeating unit)
CaU5+
(UO
2
)
2
(CO
3
)O
4
(OH)
·7H2O
Strunz classification 5.EA.15
Crystal system Orthorhombic
Disphenoidal class
Identification
Color black, violet-black (fresh); yellowish brown, greenish brown (exposed)
Crystal symmetry Orthorhombic
Point group: 222
Space group: P212121
Luster vitreous, sub-metallic, dull
Diaphaneity transparent, translucent, opaque
References [1][2]

Wyartite CaU5+
(UO
2
)
2
(CO
3
)O
4
(OH)
·7H2O is a uranium bearing mineral named after Jean Wyart (1902–1992), mineralogist at the Sorbonne, Paris. Greenish black, black, black violet in color, translucent to opaque orthorhombic crystals presentantion. 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.[3]

Determination of the structure of wyartite provided the first evidence for a pentavalent uranium mineral. Like all uranium minerals it is radioactive.

References[edit]