calcium carbonate crystal

例句：

1. 1. The mineral is used in the production of glass and ceramics.
   这种矿物用于生产玻璃和陶瓷。
2. 2. The crystals are transparent and can be used as a substitute for diamonds.
   这些晶体是透明的，可以用作钻石的替代品。
3. 3. The calcium carbonate crystals are commonly found in seashells and coral reefs.
   碳酸钙晶体通常存在于贝壳和珊瑚礁中。