ceylonite

from WordNet (r) 3.0 (2006)

Ceylonite
    n 1: a dark-colored spinel containing iron [syn: {Ceylonite},
         {pleonaste}]

from The Collaborative International Dictionary of English v.0.48

Ceylanite \Cey"lan*ite\, n. [F., fr. Ceylan Ceylon.] (Min.)
   A dingy blue, or grayish black, variety of spinel. It is also
   called {pleonaste}. [Written also {ceylonite}.]
   [1913 Webster]