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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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