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.
它的成份含﹕有机腐殖质和氮、磷、钾、钙、镁、硫及铁、铜、锌、硼、钼等多种微量元素。
Its composition containing: organic humus and nitrogen, phosphorus, potassium, calcium, magnesium, sulfur and iron, copper, zinc, boron, molybdenum and other trace elements.
在花岗岩及有关的岩石中，碱质当然显著地超过铁镁组分。
In the granites and related rocks the alkalis are, of course, noticeably in excess of the femic constituents.
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