potassium niobate

例句：

1. 1. The potassium niobate crystals are used in the production of glass.
   钾钠长石晶体用于制造玻璃。
2. 2. Potassium niobate is a mineral that can be found in many different rocks.
   钾钠长石是一种可以在许多不同岩石中找到的矿物。
3. 3. The potassium niobate crystals have been used in ancient times as a tool for cutting and shaping metals.
   钾钠长石晶体在古代被用作切割和塑造金属的工具。