normal spinel

例句：

1. 1. The mineral isused in the production of glass and ceramics.
   这种矿物用于生产玻璃和陶瓷。
2. 2. Thenormal spinel is a valuable resource formining companies.
   正常硅石是矿业公司的重要资源。
3. 3. The normal spinel has been foundto have unique properties that make it usefulin various applications.
   正常硅石被发现具有独特的性质，使其在各种应用中具有用途。