Hydrated normal vanadate, carnotite group
Specific gravity: 3.81 to 3.93
Colour: Bright yellow
Metatyuyamunite is a common dehydration product of tyuyamunite in Colorado Plateau-type
uranium-vanadium deposits, associated with tyuyamunite,
malachite and gypsum
There are four co-type localities, the Mesa number 1 mine, White Ash Peak, Lukachukai Mining District, Lukachukai Mountains, Apache county, Arizona, USA, and three in New Mexico, USA, the Laguna Mining District, the Haystack mine, McKinley county and the Shiprock District, San Juan county, all of which are sedimentary uranium deposits (Mindat).
On the Colorado Plateau, USA, metatyuyamunite occurs as masses disseminated in sandstone, in limestone mixed with carnotite and as radial aggregates to 3 mm on gypsum. It is often mixed with carnotite and tyuyamunite (Dana, AM 41.187-201).
At the Small Spot and May Day mines, Calamity Mesa, Mesa county, Colorado, USA, metatyuyamunite crystals to 3 mm formed on gypsum, which coated the walls of fractures in sandstone (AM 41.187-201).
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