Wyartite

Uranium bearing crystal

Wyartite

General
Category| Carbonate minerals
Formula| CaU5+
(UO

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]

Wyartite CaU5+
(UO

2(CO
3)O
4(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.[4] It has a hardness of 3 to 4 on the Mohs scale. 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.[4]

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

## References

[edit]

1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320\. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
2. ^ Mindat
3. ^ Mineralienatlas
4. ^ a b "Wyartite Mineral Data". Webmineral.com. Retrieved 25 February 2021.

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