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fergusonite 褐釔鈮礦 褐釔鈮礦 fergusonite n 1: a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals 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]
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