ferronemalite

例句：

1. 1. The old building has been covered in a layer of ferronemalite.
   这座旧建筑已经被一层铁锈石覆盖。
2. 2. The ironworks used ferronemalite as a decorative element.
   这家铁工厂使用铁锈石作为装饰元素。
3. 3. The ferronemalite was so dark that it almost blended into the background.
   铁锈石非常暗，几乎与背景融为一体。