鎂鐵質(英語:Mafic)用來形容富含元素與元素的矽酸鹽礦物或岩石,又稱基性岩。大多數鎂鐵質礦物顏色暗並且相對密度大於3。常見的造岩鎂鐵質礦物包括橄欖石輝石閃石黑雲母。常見的鎂鐵質岩石包括玄武岩粗玄岩輝長石

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