Found 2 items, similar to fergusonite.
English → English (WordNet) Definition: fergusonite fergusonite n : a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals
English → English (gcide) Definition: Fergusonite 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. [1913 Webster]