镁铁质(英语:Mafic)用来形容富含元素与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黑云母。常见的镁铁质岩石包括玄武岩粗玄岩辉长石

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