镁铁矿物：矿物中氧化亚铁，氧化镁的含量较高，包括橄榄石类，辉石类，角闪石类和黑云母类。这些矿物的颜色一般较深，又称为暗色矿物。
碳酸盐岩中自生碳酸盐矿物主要为文石、高镁方解石，少量白云石、铁白云石和菱铁矿。
X-ray studies show that carbonate minerals are aragonite, high-Mg calcite, and lesser dolomite, ankerite and siderite.
经x -衍射分析粉煤灰中的含铁矿物主要是以赤铁矿和磁铁矿的状态存在，少量以磁赤铁矿、镁铁尖晶石以及镁铝铁氧化物的固熔体形式存在。
The X-diffraction analysis of fly ash showed that iron minerals were mainly hematite and magnetite, small amount of magnetic hematite, Mg-Fe spinel and Mg-Fe-Al oxide solid solution.
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