Fergusonite

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  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]



From WordNet (r) 2.0 [wn]:

  fergusonite
       n : a dark mineral consisting of oxides of yttrium and erbium
           and tantalum and other minerals