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镁铁质（英语：Mafic）用来形容富含镁元素与铁元素的硅酸盐矿物或岩石，又称基性岩。大多数镁铁质矿物颜色暗并且相对密度大于3。常见的造岩镁铁质矿物包括橄榄石、辉石、闪石和黑云母。常见的镁铁质岩石包括玄武岩、粗玄岩和辉长石。
 | 此条目没有列出任何参考或来源。 (2014年10月5日) |
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