Essential Non-Metallic Minerals

Non-metallic minerals are minerals that do not contain any metal elements in their chemical composition. They are typically used for industrial purposes due to their physical properties. Among the essential non-metallic minerals are coal, clay, cement, and silica.

1. Coal:
- Coal is a combustible black or brownish-black sedimentary rock composed mostly of carbon.
- It is primarily used as a fuel for electricity generation and heat production.
- Coal is also used in the production of steel, cement, and various chemicals.

2. Clay:
- Clay refers to a group of fine-grained natural rock or soil materials that are mainly composed of hydrated phyllosilicates.
- It is used in the production of ceramics, bricks, tiles, and pottery.
- Clay is also used in the construction industry as a binder for materials like concrete and asphalt.

3. Cement:
- Cement is a fine powder that is used as a binder in concrete, mortar, and other construction materials.
- It is produced by grinding clinker, which is a combination of materials such as limestone, clay, and iron ore, and adding gypsum to control the setting time.
- Cement is a key ingredient in the construction industry and is used in the production of buildings, bridges, and infrastructure.

4. Silica:
- Silica, also known as silicon dioxide, is a common mineral found in the Earth's crust.
- It is used in various industries, including glass manufacturing, ceramics, electronics, and construction.
- Silica is a key component in the production of glass, as it imparts strength, transparency, and resistance to heat and chemicals.

Overall, these essential non-metallic minerals play a crucial role in various industries and construction activities. They provide the necessary raw materials for the production of energy, construction materials, and other essential products.

But how can cement is considered as a non-metallic mineral as per the question? Because cement is not a mineral at all