[mass noun](Geology)a dark, medium-grained igneous rock, typically with ophitic texture, containing plagioclase, pyroxene, and olivine. It typically occurs in dykes and sills (地质)粒玄岩,粗玄岩,辉绿岩。 亦称 diabase
语源
mid 19th cent.: from French dolérite, from Greek doleros 'deceptive' (because it is difficult to distinguish from diorite)