3.0 x 2.4 x 1.3 cm. Rauvite is a very rare hydrated calcium, uranyl vanadate occurring in the oxidized zones of U-V ores in Colorado Plateau-type deposits. It has questionable/doubtful status as a mineral species, according to the IMA. That being said, this very rich specimen is from near the Type Locality in Utah: Cactus Rat Mine, The Poison Strip, Thompsons Mining District, Grand Co., Utah, USA. The blackish, amorphous, waxy material is clustered in several places on the laminated shale matrix. Ex. John White Collection of Seattle. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Rauvite
Rauvite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Ca(UO₂)₂V₁₀O₂₈·16H₂O.
Key properties: specific gravity 2.92; Yellowish brown to olive streak; Adamantine to waxy luster; optically biaxial.
IMA symbol Ruv, IMA status: questionable, named in 1922.
Occurs as an uncommon mineral in the oxidized zones of U–V ores in Colorado Plateau-type deposits.
It is found associated with Carnotite, corvusite, uvanite, hewettite, metatorbernite, tyuyamunite, gypsum.
The name refers to the chemical elements RAdium, Uranium, and Vanadium.