pyroniobate

例句：

1. 1.The pyroxene is a mineral that occurs in the earth's mantle.
   辉石是一种存在于地球地幔中的矿物。
2. 2.Pyroxene is often used as a substitute for feldspar in glassmaking.
   辉石常被用作玻璃制造中的长石的替代品。
3. 3. Pyroxene is also found in some types of volcanic rocks.
   辉石也存在于某些类型的火山岩中。