Rauvite
Cactus Rat Mine, The Poison Strip, Thompsons Mining District, Grand County, Utah, USA
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. The blackish, amorphous, waxy ...
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