Volborthite, Tyuyamunite

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Volborthite is an uncommon hydrated copper vanadate secondary mineral found in the oxidized zones of vanadium-bearing hydrothermal deposits. This bright, large cabinet specimen is richly covered with tiny, sparkly, forest-green volborthite blades and canary-yellow, discrete microcrystals of the hydrated calcium uranyl vanadate tyuyamunite. This is an excellent, large combination specimen on blocky, sandstone matrix of these uncommon species.