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Its industrial types of ore bodies are weak magnetic type which should be chosen. Its ore-forming types are magnetic biotite schist and magnetic granulite type.
矿石工业类型为需选弱磁性铁矿石，主要成因类型为磁铁黑云片岩型、磁铁变粒岩型。
The Mengjiatun Formation complex is a suite of supracrustal rocks formed in the early Neoarchean, and its typical rocks include garnet quartzite, biotite-quartz schist and amphibolite.
孟家屯岩组为鲁西新太古代早期形成的一套表壳岩，代表性的岩石类型为石榴石英岩、黑云母石英片岩、斜长角闪岩等。
That suit of schist contans a large number of abundant aluminium mineral: staurolite, almandine and biotite, so the primitive is mostly clayrock.
该套片岩主要由富铝矿物十字石、铁铝榴石和大量黑云母组成，因而其原岩以粘土岩为主。
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