mafic例句

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.

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.