**Chemical Formula of Marble:**

Marble is a metamorphic rock that is composed mainly of calcium carbonate (CaCO3). The chemical formula of marble is therefore **CaCO3**. It is formed through the metamorphism of limestone, which is a sedimentary rock composed primarily of calcium carbonate.

**Calcium Carbonate (CaCO3):**

Calcium carbonate is a chemical compound that consists of calcium ions (Ca2+) and carbonate ions (CO3^2-). It occurs naturally in various forms, including limestone, chalk, and marble. The chemical formula of calcium carbonate indicates that it is composed of one calcium ion bonded to one carbonate ion.

**Formation of Marble:**

1. **Limestone Formation:** Limestone is formed through the accumulation and compaction of the remains of marine organisms such as coral, shells, and algae. These organisms extract calcium carbonate from the surrounding water to build their shells and skeletons.

2. **Metamorphism:** When limestone is subjected to heat and pressure over a long period of time, it undergoes metamorphism and transforms into marble. The heat and pressure cause the calcium carbonate crystals in limestone to recrystallize, resulting in a more compact and durable rock.

**Properties of Marble:**

1. **Appearance:** Marble is known for its beautiful appearance and unique veining patterns. It is available in various colors, including white, gray, black, and various shades of red, green, and blue.

2. **Hardness:** Marble is a relatively soft rock with a Mohs hardness of 3-4. It can be easily scratched by harder materials like quartz or diamond.

3. **Acid Reaction:** Marble is sensitive to acids and can be easily damaged or etched by acidic substances. This is due to the presence of calcium carbonate, which reacts with acids to form carbon dioxide gas, water, and a dissolved calcium salt.

4. **Uses:** Due to its aesthetic appeal and durability, marble is widely used in construction, sculpture, and decorative applications. It is commonly used as a building material for floors, countertops, and walls. It is also used in the production of lime, cement, and calcium supplements.

In conclusion, the chemical formula of marble is CaCO3, indicating that it is primarily composed of calcium carbonate. Marble is formed through the metamorphism of limestone and exhibits unique properties such as its appearance, hardness, and reaction to acids. Its versatility and aesthetic appeal make it a widely used material in various industries.

Caco3 is the chemical formula of marble