ferriferous gneiss

例句：

1. 1. The mine was discovered in the ferriferous gneiss of the mountain.
   这个矿是在山里的铁质岩中发现的。
2. 2.The iron gneiss is a common type of rock found in many parts of the world.
   铁质岩是一种在世界许多地方都能找到的常见岩石类型。
3. 3.The geologists were able to identify the ferriferous gneiss as the source of the mineral deposit.
   地质学家能够确定铁质岩是矿物矿床的来源。