Tyuyamunite, Volborthite

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