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adj. 铁镁质的; 精选例句 高考 1、 Biotite is a subordinate constituent of the mafic and ultramafic rocks generally. 黑云母一般是镁铁质及超镁铁质岩石中的次要成分. 来源:辞典例句 2、 Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton. 华北克拉通中部广泛发育晚前寒武纪镁铁质岩墙群. 来源:网络期刊摘选