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Tungstate

Uranotungstite

Fe(UO₂)₂(WO₄)(OH)₄·12H₂O
Hardness2
Crystal systemOrthorhombic
ClassTungstate
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Uranotungstite specimen

Uranotungstite Locality: Krunkelbach Valley Uranium deposit, Menzenschwand, Black Forest, Baden-Württemberg, Germany Yellow-orange aggregates of uranotungstite (analysed). Field of view 3 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0

Uranotungstite

Uranotungstite is an IMA-recognized mineral species in the tungstate class, with the chemical formula Fe(UO₂)₂(WO₄)(OH)₄·12H₂O.

It crystallizes in the orthorhombic crystal system.

Key properties: Mohs hardness 2; specific gravity 4.03; Yellow streak; Dull luster; optically biaxial.

IMA symbol Utgs, IMA status: approved, named in 1984.

A rare secondary mineral formed in polymetallic base metal deposits.

It is found associated with Metauranocircite, metaheinrichite, bergenite, metatorbernite, metazeunerite, schoepite, quartz.

The name refers to its content of URANium and TUNGsten.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more U minerals or help write this entry.