ceylanite

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]