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adj. 鐵鎂質(zhì)的; 精選例句 高考 1、 Biotite is a subordinate constituent of the mafic and ultramafic rocks generally. 黑云母一般是鎂鐵質(zhì)及超鎂鐵質(zhì)巖石中的次要成分. 來(lái)源:辭典例句 2、 Late Precambrian mafic dyke swarms are extensively developed in the central North China Craton. 華北克拉通中部廣泛發(fā)育晚前寒武紀(jì)鎂鐵質(zhì)巖墻群. 來(lái)源:網(wǎng)絡(luò)期刊摘選