角闪岩又名斜长角闪岩,是主要由角闪石斜长石组成的区域变质岩,是由富白云质泥灰岩和其他基性岩石,在中温至高温区域变质条件下,形成的岩石,具有块状或微显片理构造,经常与片岩片麻岩共生,伴生的矿物有铁榴石、绿帘石、黝帘石、以及黑云母、透辉石等。

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角闪岩在工业上可以用作铸石的附加原料,耐磨、耐腐蚀、硬度大。

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