Volborthite, Tyuyamunite and Malachite

Item Description

The blocky sandstone matrix is richly covered with tiny, sparkly, olive-green volborthite blades, a dusting of canary-yellow, discrete, microcrystals of the uranium oxide tyuyamunite and aesthetically capped with a vein of green malachite. Volborthite is an uncommon hydrated copper vanadate secondary mineral found in the oxidized zones of vanadium-bearing hydrothermal deposits. This showy specimen is a highly representative combination piece featuring these uncommon species. Valued at $300-400