Barronite

barronite

metauranocircite

arsenuranospathite

arsenovanmeersscheite

Images

Formula: (◻0.5Ba0.5)(UO2)2Si5O12(OH).2H2O
Nesosilicate (insular SiO4 groups), barium-bearing uranyl mineral
Crystal system: Monoclinic
Environments

Plutonic igneous environments
Sedimentary environments

Barronite is a new mineral, approved in 2024 and, as of May 2025, pending publication

Localities

At the type locality, Krunkelbach Valley Uranium deposit, Menzenschwand, St Blasien, Waldshut, Freiburg Region, Baden-Württemberg, Germany, barronite, a weeksite-like uranyl silicate mineral, has been found. The Menzenschwand region is a relatively prolific locality for uranyl minerals, with more than 40 different species discovered there to date (2024), and serving as the type locality for at least eight of them, including metauranocircite, joliotite, arsenuranospathite, uranosilite, uranotungstite, arsenovanmeersscheite, nielsbohrite and heisenbergite.
Barronite formed from supergene processes, occurring as radial and globular aggregates of acicular, pale yellow crystals within abundant baryte (source of Ba) and quartz, and associated with other secondary uranyl silicates, arsenates, and phosphates (AM 110.5.828).
Barronite from the Krunkelbach Valley Uranium deposit - Image

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