wittingite

例句：

1. 1. The wittingite is a rare mineral that can be found in the Earth's crust.
   钨是一种稀有矿物，可以在地球的地壳中找到。
2. 2. The wittingite is used in cutting tools and electrical equipment.
   钨被用于切割工具和电气设备中。
3. 3. The wittingite is also known as tungsten, which is a valuable metal.
   钨也被称为钨，是一种有价值的金属。