铁锰重石

例句：

1. 1. The iron-manganese heavy stone is a valuable mineral resource.
   铁锰重石是一种宝贵的矿物资源。
2. 2. The iron-manganese heavy stone is widely used in the construction industry.
   铁锰重石在建筑业中被广泛使用。
3. 3. The iron-manganese heavy stone has been found in many places around the world.
   铁锰重石在世界许多地方都有发现。