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Answer for the clue "A gummy orange mixture of uranium oxides and silicates occurring naturally in the hydration and oxidation of pitchblende ", 7 letters:
gummite

Word definitions for gummite in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Gummite \Gum"mite\, n. [So called because it occurs in rounded or flattened pieces which look like gum.] (Min.) A yellow amorphous mineral, essentially a hydrated oxide of uranium derived from the alteration of uraninite.

Wikipedia Word definitions in Wikipedia
The material was also known under various names, mostly because of different origins of the samples, including: eliasite from Elias – the name of a mine at Jáchymov , coracite – a variety from Lake Superior , pittinite, pechuran, urangummit, and uranogummite. ...

WordNet Word definitions in WordNet
n. a gummy orange mixture of uranium oxides and silicates occurring naturally in the hydration and oxidation of pitchblende

Wiktionary Word definitions in Wiktionary
n. (context mineral English) A yellow, amorphous mineral, a mixture of oxides and silicates of uranium, formed by weathering of pitchblende.