pleonaste


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Related to pleonaste: Ceylonite

pleonaste

(ˈpliːəˌnæst)
n
(Geological Science) mineralogy a type of blackish mineral
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Noun1.pleonaste - a dark-colored spinel containing iron
spinel - a hard glassy mineral consisting of an oxide of magnesium and aluminum; occurs in various colors that are used as gemstones