[mass noun](Geology)a basaltic rock containing augite and a calcium-poor pyroxene (pigeonite or hypersthene), and with a higher silica content than an alkali basalt (地质)拉斑玄武岩
派生 tholeiitic [ˌθəʊlɪˈɪtɪk] adjective 语源
mid 19th cent.: from Tholei, the name of a village (now Tholey) in the Saarland, Germany, + -ite