Non-Metallic Minerals - CBSE Class 10 – Geography

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1. Non-Metallic Minerals: Introduction

• Non-metallic minerals are minerals that do not contain metals in their chemical composition.
• These minerals have varied uses in different industries and in our daily life.
• They are different from metallic minerals like iron or copper. Non-metallic minerals do not yield new products when melted.
• Examples: Mica, Limestone, Gypsum, Coal, Salt.

Key Points:

• Do not contain metals.
• Crucial for construction, manufacturing, and household uses.

Examples:

1. Talc (used in powder) is a non-metallic mineral.
2. Salt in kitchens is also non-metallic.
3. Coal used for fuel is non-metallic.

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2. Mica

About Mica

• Mica is a group of silicate minerals.
• Mica splits easily into thin, transparent, elastic sheets.
• It can handle high heat. Mica does not conduct electricity. So, it is a superb insulator in electrical appliances.

Important Points:

• Mica is both flexible and tough.
• Large sheets of mica are rare and costly.

Distribution in India

• India is the largest global producer and exporter of mica.
• Main mica belts are in:
  • Jharkhand: The Koderma-Gaya-Hazaribagh belt is most famous.
  • Andhra Pradesh: Nellore district has large reserves.
  • Rajasthan: Some production.
  • Bihar (part of older records, now Jharkhand after state split).

Industrial Uses

• Electrical Industry:
  • Used in electrical insulators, capacitors, and electronic components.
  • Essential because of heat and electricity insulation.
• Cosmetics Industry:
  • Used as a shimmering agent in makeup and powders.
• Paints and Rubber Industry:
  • Mixed in paints for shine and in rubber to improve strength and flexibility.
• Construction Industry:
  • Used in dry wall joint compounds and specialty wall paints.

Examples:

1. Electrical appliances: Mica strips in toasters prevent short circuits.
2. Cosmetics: Face powders and eye shadows get their sparkle from mica.
3. Paints: Mica gives a pearly shine to car paints.

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3. Limestone

About Limestone

• Mostly composed of calcium carbonate (CaCO₃).
• It is a sedimentary rock, usually found in sedimentary basins.

Important Points:

• Limestone is the main raw material for cement.
• Easily shaped, so used in art and architecture.

Distribution in India

• Largest reserves in Rajasthan.
• Other states: Andhra Pradesh, Madhya Pradesh, Chhattisgarh, Gujarat, Tamil Nadu, Himachal Pradesh.

Industrial Uses

• Cement Industry:
  • Limestone is the chief ingredient of cement. It is used directly in making cement clinkers.
• Iron and Steel Industry:
  • Used as a flux to remove impurities during melting of iron ore.
• Glass Industry:
  • Mixed with sand to make glass.
• Chemical Industry:
  • Used to make lime, bleaching powder, and caustic soda.
• Paper and Sugar Industries:
  • Used to neutralize acids and purify products.

Examples:

1. Cement: Every building with concrete uses cement made from limestone.
2. Chalk: Traditional classroom chalk is made from limestone.
3. Glass-making: Glass in windows contains limestone.

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4. Gypsum

About Gypsum

• Gypsum’s chemical formula: CaSO₄·2H₂O (calcium sulphate dihydrate).
• It is soft, white or grey, and found in sedimentary beds.

Important Points:

• Used directly as a fertilizer.
• Essential for construction and in medicine as plaster.

Distribution in India

• Rajasthan is the major producer.
• Also found in Tamil Nadu, Jammu and Kashmir, Gujarat, Uttar Pradesh, Punjab.

Industrial Uses

• Cement Industry:
  • Gypsum slows down the setting of cement, giving workers time to shape concrete.
• Fertilizer Industry:
  • Improves soil conditions and makes some types of fertilizer.
• Plaster Industry:
  • Used to make Plaster of Paris (POP) for false ceilings, wall boards.
  • Used for medical casts.
• Art and Sculpture:
  • Plaster of Paris is used to make sculptures and moldings.

Examples:

1. POP casts: Doctors use it to set broken bones.
2. False ceilings: Gypsum boards make most modern false ceilings.
3. Soil treatment: Gypsum is spread on farmlands to improve clay soil.

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Summary Table

Mineral	States Found	Main Industrial Uses	Example Products
Mica	Jharkhand, Andhra Pradesh, Rajasthan	Electrical insulation, cosmetics, paints, rubber	Electrical parts, makeup, shiny paints
Limestone	Rajasthan, MP, Chhattisgarh, AP, Gujarat	Cement, steel, glass, chemicals, chalk	Cement, chalk, glass, paper
Gypsum	Rajasthan, TN, J&K, Gujarat, UP, Punjab	Cement retarder, fertilizer, POP, casts	False ceilings, fertilizer, medical casts

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Fun Activity: Comparing Non-Metallic Minerals

Activity Steps:

1. Collect three simple items from home: chalk (representing limestone), eye shadow or cosmetic shimmer (mica), and a small piece of plaster or a cast (gypsum/POP).
2. Observe and write down:
   • How does each feel to the touch?
   • Does it easily break or remain flexible?
   • Can you see a shine (mica), softness (gypsum), or dustiness (chalk/limestone)?
3. Discuss what industrial use matches each property observed.

Observations:

• Mica is shiny, thin, and flexible.
• Gypsum (POP) is soft, easily scratched or carved.
• Limestone (chalk) leaves dust and is powdery.

Examples from Activity:

• The shine tells why mica is used in cosmetics.
• Softness explains why gypsum is good for making casts and ceilings.
• Chalkiness of limestone links to its use in cement and chalk.

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Scenario Based Questions

1. Scenario: You are an architect designing earthquake-safe buildings.

   • Question: Which non-metallic mineral would you use to make strong walls and why?
   • Answer: I would use limestone to make cement for strong walls. Limestone is the primary raw material for cement, which is essential for durable construction.

2. Scenario: Your friend wants to create glittery makeup at home for a school project.

   • Question: Which mineral should they use and what property makes it ideal?
   • Answer: They should use mica because it splits into thin, shiny sheets and adds shimmer to products.

3. Scenario: A steel factory is facing problems with impurities in steel.

   • Question: Which mineral should be used to remove impurities and how does it work?
   • Answer: Limestone should be used as a flux. It combines with impurities to form slag, which can be removed from the molten steel.

4. Scenario: The local hospital needs material for making casts for broken bones.

   • Question: Which non-metallic mineral would be used, and what is its form?
   • Answer: Gypsum, in the form of Plaster of Paris, will be used to make medical casts for setting broken bones.

5. Scenario: A farmer wants to improve the quality of clayey soil on his farm.

   • Question: Which mineral would help with this problem and why?
   • Answer: The farmer should use gypsum as it acts as a soil conditioner and improves the structure of heavy clay soils.

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Learning about these minerals can be fun! Try finding products at home that use mica, limestone, or gypsum and guess which industry they came from.

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