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The Collaborative International Dictionary
pleonaste

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.]

Wiktionary
pleonaste

n. (context mineralogy English) A black variety of spinel.

WordNet
pleonaste

n. a dark-colored spinel containing iron [syn: Ceylonite]