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。
2
Transitional tervain from siliceous rock to clayrock, both interbed and altered clayrock are favourable strata of all kinds of elements concentrated mineralization underneath the Cambrian.