碳酸钙(Calcium carbonate)

        碳酸钙是一种无机化合物，是地球上常见物质之一，存在于霰石、方解石、白垩、石灰岩、大理石、石灰华等岩石内。它是重要的建筑材料，工业上用途甚广，也是一种常用的补钙剂。

Calcium carbonate is an inorganic compound and one of the common substances on the earth. It exists in rocks such as aragonite, calcite, chalk, limestone, marble, and travertine. It is an important building material with a wide range of applications in industry. It is also a commonly used calcium supplement.