Gummite, Uraninite (Var: Pitchblende)
Pick's Delta Mine, San Rafael Swell Mining District, Emery County, Utah, USA
Gummite is a radioactive mineral, a mixture of uranium minerals, oxides, silicates, hydrates and hydrous oxides of uranium, derived from the alteration of uraninite. It is named for its gum-like consistency. Here you see a layer of yellow-orange gummite on a matrix of pitchblende. Hard to obtain! From the collection of noted California collector ...
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