• (n.) A dingy blue, or grayish black, variety of spinel. It is also called pleonaste.
Cey'lan·ite noun [ French, from Ceylan Ceylon.] (Min.) A dingy blue, or grayish black, variety of spinel. It is also called pleonaste . [ Written also ceylonite .]
Ceylanite (pleonaste) is a dingy blue, or greyish black, variety of spinel.