carbonate calculus

例句：

1. 1. The mineral is used as a food additive in many foods.
   这种矿物质被用作许多食物的添加剂。
2. 2. This chemical compound is commonly found in oceans and lakes.
   这种化学化合物在海洋和湖泊中很常见。
3. 3.Carbonates are important for the formation of limestone.
   碳酸盐对于石灰石的形成非常重要。