wyartite

{{Short description|Uranium bearing crystal}}

{{Infobox mineral

| name = Wyartite

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| category = Carbonate minerals

| formula = {{Chem|CaU|5+|(UO|2|)|2|(CO|3|)O|4|(OH)}}·7H₂O

| IMAsymbol = Wya{{Cite journal |last=Warr |first=L.N. |date=2021 |title=IMA–CNMNC approved mineral symbols |journal=Mineralogical Magazine |volume=85 |issue=3 |pages=291–320 |bibcode=2021MinM...85..291W |doi=10.1180/mgm.2021.43 |s2cid=235729616 |doi-access=free}}

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| strunz = 5.EA.15

| system = Orthorhombic

| class = Disphenoidal (222)
Space group: (222)

| symmetry = P2₁2₁2₁

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| color = black, violet-black (fresh); yellowish brown, greenish brown (exposed)

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| luster = vitreous, sub-metallic, dull

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| diaphaneity = transparent, translucent, opaque

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| other = 25px Radioactive

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| references = [http://www.mindat.org/min-4319.html Mindat][https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Wyartite Mineralienatlas]

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Wyartite {{Chem|CaU|5+|(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. It has greenish-black, black, or violet-black, translucent to opaque orthorhombic crystals. 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.{{Cite web |title=Wyartite Mineral Data |url=http://www.webmineral.com/data/Wyartite.shtml |access-date=25 February 2021 |website=Webmineral.com}}

Determination of the structure of wyartite provided the first evidence for a pentavalent uranium mineral. Like all uranium minerals it is radioactive.{{cn|date=January 2025}}