What is Calcium carbonate

Calcium carbonate (CaCO₃) is a chemical compound commonly found in nature and has a wide range of applications. It is composed of calcium, carbon and oxygen atoms. Here are some key aspects of calcium carbonate:

What is Calcium carbonate

1. Natural Occurrence: Calcium carbonate is a common mineral found in rocks and minerals, especially in limestone, marble and chalk. It is also a major component of the shells and skeletons of marine organisms such as coral, molluscs and some algae.

2. Antacid: Calcium carbonate is commonly used as an antacid to relieve symptoms of indigestion, heartburn and acid reflux. It works by neutralizing the excess stomach acid.

3. Dietary supplement: Calcium carbonate is used as a dietary supplement to provide calcium, an essential mineral that supports bone health, muscle function, nerve transmission, and various other physiological processes in the body .

4. Calcium source: It is used in the food and beverage industry as a calcium source, adding it to products such as fortified juices, milk substitutes and breakfast cereals.

5. Calcium Carbonate Powder: In powder form, calcium carbonate is used as a calcium supplement and as an ingredient in a variety of products including baking powder, toothpaste, and some medications.

6. Calcium carbonate in manufacturing: Crushed limestone, a form of calcium carbonate, is a major ingredient in cement production. It provides the essential calcium component that reacts with other materials to form concrete.

7. Calcium carbonate in agriculture: Calcium carbonate is used in agriculture as a soil conditioner to improve soil structure and fertility. It can also be used to raise soil pH in acidic soils.

8. Filler in products: Calcium carbonate is used as a filler in products such as paint, rubber, plastic and paper. It improves the physical properties of these materials and reduces the production cost.

9. Marble and Chalk: Marble, which is a metamorphosed limestone, is used for sculpture, construction and for decorative purposes. Chalk, another form of calcium carbonate, has historically been used to write on chalkboards.

10. Water treatment: Calcium carbonate can be used in water treatment processes to help control pH and remove impurities.


  • Calcium carbonate is a white, odorless powder with a crystalline structure.
  • It is relatively insoluble in water but can dissolve in acidic solutions due to reaction with acids.
  • It can react with acids to generate carbon dioxide gas, which is why it is often used as an antacid.
  • The Mohs hardness scale places it at 3, which means it is relatively soft compared to other minerals.
  • Overall, calcium carbonate has a wide range of applications due to its natural abundance, its role as a calcium source, and its ability to interact with other substances in a variety of ways.