phyllite

例句：

1. 1.The phyllite formation is a rich source of minerals.
   该板岩形成是一种丰富的矿物资源。
2. 2. The phyllite layer is very thin and difficult to dig through.
   该层板岩非常薄，难以挖掘。
3. 3.The phyllite has been used in ancient architecture for its durability.
   该层板岩在古代建筑中因其耐用性而被使用。