graphite-schist

例句：

1. 1.The mine is rich in graphite-schist, which is highly valuable for metallurgical use.
   该矿富含石墨片岩，对于冶金用途极具价值。
2. 2. The graphite-schist was mined from the area and used to make electrical equipment.
   石墨片岩从该地区开采出来，用于制造电器设备。
3. 3.The graphite-schist has a unique mineral composition that makes it useful for various applications.
   石墨片岩具有独特的矿物组成，适用于各种应用。