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Answer for the clue "A dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals ", 11 letters:
fergusonite

Word definitions for fergusonite in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Fergusonite \Fer"gu*son*ite\, n. (Min.) A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson.

WordNet Word definitions in WordNet
n. a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals

Wiktionary Word definitions in Wiktionary
n. A mineral composed of oxides of various rare earth elements.

Wikipedia Word definitions in Wikipedia
Fergusonite is a mineral comprising a complex oxide of various rare earth elements. The chemical formula of fergusonite species is (Y,RE)NbO, where RE = rare-earth elements in solid solution with Y. Yttrium is usually dominant (the species fergusonite-(Y)), ...