Bariandite is a rare hydrated aluminum vanadate which occurs as dark blue-black, submetallic, monoclinic, radiating, fibrous aggregates in voids among quartz grains. The type locality is Mounana mine, Franceville, Haut-Ogooue, Gabon, a sedimentary uranium deposit hosted by fractured Precambrian metasediments. Bariandite was named in 1971 in honor of Pierre Bariand, Curator of Mineralogy, Pierre and Marie Curie's University, Paris, France. Other notable localities include: Duggan adit, Uravan district, Montrose Co., Colorado, and the Firefly–Pigmay mine, La Sal quadrangle, San Juan Co., Utah, USA; Ragra Mine (Minasragra), Huayllay District, Pasco Province, Pasco Department, Peru.
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