铁镁质的含有或与一组深色矿物有关的，主要由镁和铁组成，出现在火成岩中的。
Containing or relating to a group of dark-colored minerals, composed chiefly of magnesium and iron, that occur in igneous rocks.
铁镁质的含有或与一组深色矿物有关的，主要由镁和铁组成，出现在火成岩中的。
Containing or relating to a group of dark-colored minerals, composed chiefly of magnesium and iron, that occur in igneous rocks.
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