1. What is a Mineral?
Minerals are an indispensable part of our lives — from a tiny pin to a towering building or a big ship, railways, roads, machinery — all are made from minerals. Geologists define mineral as a “homogenous, naturally occurring substance with a definable internal structure.” Minerals are found in varied forms — from the hardest diamond to the softest talc.
Over 2000 minerals have been identified, but only a few are abundantly found in most rocks. A mineral’s properties (colour, hardness, crystal form, lustre, density) depend on the physical and chemical conditions under which it was formed.
🔵 NCERT Sidebars – Minerals in Daily Life
Toothpaste: Abrasive minerals — silica, limestone, aluminium oxide, phosphate minerals; Fluoride from mineral fluorite; Whitening agent from titanium oxide (rutile, ilmenite, anatase); Sparkle from mica; Toothbrush & tube from petroleum plastics.
Living things need minerals: Though mineral intake is only about 0.3% of total nutrient intake, without them we cannot utilise the other 99.7% of foodstuffs.
Kudremukh fact: ‘Kudre’ in Kannada means horse — the highest peak in Western Ghats of Karnataka resembles a horse’s face. Bailadila hills look like the hump of an ox — hence the name.
Living things need minerals: Though mineral intake is only about 0.3% of total nutrient intake, without them we cannot utilise the other 99.7% of foodstuffs.
Kudremukh fact: ‘Kudre’ in Kannada means horse — the highest peak in Western Ghats of Karnataka resembles a horse’s face. Bailadila hills look like the hump of an ox — hence the name.
2. Classification of Minerals (Fig. 5.1)
Fig. 5.1: Classification of Minerals (NCERT)
| Category | Sub-type | Examples |
|---|---|---|
| Metallic | Ferrous (containing iron) | Iron ore, Manganese, Nickel, Cobalt |
| Non-Ferrous | Copper, Lead, Tin, Bauxite | |
| Precious | Gold, Silver, Platinum | |
| Non-Metallic | – | Mica, Salt, Potash, Sulphur, Granite, Limestone, Marble, Sandstone |
| Energy Minerals | – | Coal, Petroleum, Natural Gas |
3. Mode of Occurrence of Minerals
Minerals are usually found in “ores” — an accumulation of any mineral mixed with other elements, with sufficient concentration to make extraction commercially viable.
| # | Mode | Description | Examples |
|---|---|---|---|
| (i) | Veins and Lodes | In igneous and metamorphic rocks — minerals in cracks, crevices, faults or joints. Smaller = veins; larger = lodes. Formed when minerals in liquid/molten/gaseous form are forced upward and cool & solidify. | Tin, copper, zinc, lead |
| (ii) | Beds or Layers | In sedimentary rocks — formed by deposition, accumulation and concentration in horizontal strata under heat and pressure. Gypsum, potash salt and sodium salt formed by evaporation especially in arid regions. | Coal, iron ore, gypsum, potash salt, sodium salt |
| (iii) | Residual deposits | Decomposition of surface rocks; removal of soluble constituents leaving a residual mass of weathered material. | Bauxite |
| (iv) | Placer deposits | Alluvial deposits in sands of valley floors and base of hills; contain minerals not corroded by water. | Gold, silver, tin, platinum |
| (v) | Ocean waters | Vast quantities but too diffused for most. Ocean beds are rich in manganese nodules. | Common salt, magnesium, bromine; manganese nodules |
📌 Rat-Hole Mining (NCERT Interesting Fact)
Most minerals in India are nationalised — extraction requires government permission. But in most tribal areas of north-east India, minerals are owned by individuals or communities. In Meghalaya, coal mining in Jowai and Cherapunjee is done by family members in the form of a long narrow tunnel — known as ‘Rat-hole’ mining. The National Green Tribunal has declared such activities illegal and recommended they be stopped forthwith.
🔵 Mineral Distribution in India (Key Pattern)
Peninsular rocks → most reserves of coal, metallic minerals, mica and non-metallic minerals.
Sedimentary rocks of Gujarat and Assam → most petroleum deposits.
Rajasthan → reserves of many non-ferrous minerals.
Vast alluvial plains of north India → almost devoid of economic minerals.
Sedimentary rocks of Gujarat and Assam → most petroleum deposits.
Rajasthan → reserves of many non-ferrous minerals.
Vast alluvial plains of north India → almost devoid of economic minerals.
4. Ferrous Minerals
Ferrous minerals account for about three-fourths of the total value of production of metallic minerals. They provide a strong base for metallurgical industries. India exports substantial quantities of ferrous minerals after meeting internal demands.
Iron Ore
Iron ore is the basic mineral and the backbone of industrial development. India is rich in good quality iron ores.
| Type | Iron Content | Key Property |
|---|---|---|
| Magnetite | Up to 70% (finest) | Excellent magnetic qualities — especially valuable in electrical industry |
| Hematite | 50–60% | Most important industrial iron ore in terms of quantity used |
In 2018-19, 97% of iron ore production came from Odisha, Chhattisgarh, Karnataka and Jharkhand.
Major Iron Ore Belts
| Belt | States | Key Facts |
|---|---|---|
| Odisha-Jharkhand belt | Odisha, Jharkhand | High grade hematite in Badampahar mines (Mayurbhanj & Kendujhar, Odisha); Gua & Noamundi in Singbhum district, Jharkhand |
| Durg-Bastar-Chandrapur belt | Chhattisgarh, Maharashtra | Bailadila range in Bastar, Chhattisgarh — 14 deposits of super high grade hematite; best physical properties for steel making; exported to Japan and South Korea via Vishakhapatnam port |
| Ballari-Chitradurga-Chikkamagaluru-Tumakuru belt | Karnataka | Kudremukh mines in Western Ghats — 100% export unit; one of the largest deposits in world; ore transported as slurry via pipeline to port near Mangaluru |
| Maharashtra-Goa belt | Maharashtra (Ratnagiri), Goa | Not very high quality but efficiently exploited; exported through Marmagao port |
Manganese
Fig. 5.3: Production of Manganese — State-wise share (2018–19)
| Use | State-wise share (2018-19) |
|---|---|
| Manufacturing of steel and ferro-manganese alloy; 10 kg of manganese required per tonne of steel; also used in bleaching powder, insecticides and paints | MP 33% | Maharashtra 27% | Odisha 16% | Karnataka 12% | AP 10% | Others 2% |
India: Distribution of Iron Ore, Manganese, Bauxite and Mica (NCERT)
5. Non-Ferrous Minerals
India’s reserves and production of non-ferrous minerals is not very satisfactory. However, copper, bauxite, lead, zinc and gold play a vital role in metallurgical, engineering and electrical industries.
Copper
India is critically deficient in copper reserve and production. Properties: malleable, ductile, good conductor → used in electrical cables, electronics and chemical industries.
Leading producers: Balaghat mines (MP), Khetri mines (Rajasthan), Singhbhum district (Jharkhand).
Bauxite
Fig. 5.5: Production of Bauxite — State-wise share (2018–19)
| Feature | Details |
|---|---|
| Formation | Clay-like substance; formed by decomposition of rocks rich in aluminium silicates |
| Aluminium properties | Combines strength of metals like iron with extreme lightness, good conductivity and great malleability |
| Major deposits | Amarkantak plateau, Maikal hills, plateau region of Bilaspur-Katni |
| Largest producer (2018-19) | Odisha — 65%; Panchpatmali deposits in Koraput district are most important |
| Other states | Jharkhand 10%, Gujarat 9%, Chhattisgarh 6%, Maharashtra 6%, MP 3% |
📌 Napoleon & Aluminium (NCERT Interesting Fact)
After the discovery of aluminium, Emperor Napoleon III wore buttons/hooks made of aluminium and served food to his most illustrious guests in aluminium utensils, while less honourable guests were served in gold and silver. Thirty years later, aluminium bowls were most common with beggars in Paris — illustrating how technology transforms the value of minerals.
6. Non-Metallic Minerals
Mica
Mica is a mineral made of a series of plates or leaves that split easily into thin sheets (a thousand sheets can be layered into a few cm). Mica can be clear, black, green, red, yellow or brown. Due to its excellent di-electric strength, low power loss factor, insulating properties and resistance to high voltage — mica is one of the most indispensable minerals in electric and electronic industries.
| Belt / Area | State | Note |
|---|---|---|
| Koderma – Gaya – Hazaribagh belt | Jharkhand | Leading producer (northern edge of Chota Nagpur plateau) |
| Around Ajmer | Rajasthan | Major mica producing area |
| Nellore mica belt | Andhra Pradesh | Important producer |
Limestone
Fig. 5.7: Production of Limestone — State-wise share (2018–19)
Found in sedimentary rocks (calcium carbonates or calcium and magnesium carbonates). Basic raw material for cement industry and essential for smelting iron ore in the blast furnace.
State-wise (2018-19): Rajasthan 22% | AP 13% | MP 13% | Chhattisgarh 11% | Karnataka 10% | Telangana 7% | Gujarat 6% | TN 5% | Maharashtra 4% | Others 9%.
7. Hazards of Mining (NCERT Sidebar + Jharia Newspaper)
‘Jharia to be shifted’ — Coal Fire Catastrophe; ‘Over 50% of coal-belt mines unsafe’; ‘Safety standards were not in place’ (NCERT Newspaper Insert, Chapter 5)
| Hazard Type | Description |
|---|---|
| Health hazards | Dust and noxious fumes → pulmonary diseases |
| Physical safety | Collapsing mine roofs, inundation and fires in coal mines are constant threats |
| Water contamination | Water sources get contaminated due to mining |
| Land degradation | Dumping of waste and slurry → degradation of land and soil; increase in stream/river pollution |
| Jharia (coal fire) | Underground fires burning for years; entire township to be shifted; cost Rs 20,000 crore; coal worth Rs 60,000 crore lying unutilised beneath |
⚠️ Stricter safety regulations and implementation of environmental laws are essential to prevent mining from becoming a “killer industry”.
8. Conservation of Minerals
Total volume of workable mineral deposits is an insignificant fraction — just 1% of the earth’s crust. We are rapidly consuming mineral resources that required millions of years to form. Geological processes of mineral formation are so slow that replenishment rates are infinitely small compared to consumption rates. Mineral resources are finite and non-renewable.
Continued extraction leads to increasing costs as extraction moves to greater depths, with decrease in quality. Conservation measures:
- Use mineral resources in a planned and sustainable manner
- Develop improved technologies to use low grade ores at low cost
- Recycling of metals, using scrap metals and substitutes
9. Energy Resources – Overview
| Category | Sources |
|---|---|
| Conventional | Firewood, cattle dung cake, coal, petroleum, natural gas, electricity (hydel and thermal) |
| Non-Conventional | Solar, wind, tidal, geothermal, biogas, atomic energy |
📌 Rural Energy
Firewood and cattle dung cake are most common in rural India. More than 70% of energy requirement in rural households is met by these two. Using dung cake is being discouraged because it consumes most valuable manure which could be used in agriculture.
10. Conventional Energy – Coal
Coal is the most abundantly available fossil fuel in India. India is highly dependent on coal for commercial energy requirements. Used for: power generation, industry energy, domestic needs.
Types of Coal (in order of quality)
| Type | Characteristics | Key Location |
|---|---|---|
| Peat | Decaying plants in swamps; low carbon, high moisture, low heating capacity | – |
| Lignite | Low grade brown coal; soft with high moisture content | Neyveli, Tamil Nadu — used for electricity generation |
| Bituminous | Most popular coal in commercial use; buried deep, subjected to increased temperatures | Gondwana fields |
| Metallurgical coal | High grade bituminous coal; special value for smelting iron in blast furnaces | Damodar valley |
| Anthracite | Highest quality hard coal | – |
Geological Ages of Coal in India
| Geological Age | Age | Type | Location |
|---|---|---|---|
| Gondwana coal | ~200 million years old | Metallurgical coal | Damodar valley (WB–Jharkhand): Jharia, Raniganj, Bokaro; also Godavari, Mahanadi, Son and Wardha valleys |
| Tertiary coal | ~55 million years old | Non-metallurgical | North-eastern states: Meghalaya, Assam, Arunachal Pradesh, Nagaland |
🔵 Key Fact
Coal is a bulky material that loses weight on use (reduced to ash). Hence, heavy industries and thermal power stations are located on or near the coalfields.
India: Distribution of Coal, Oil and Natural Gas (NCERT)
11. Conventional Energy – Petroleum
Petroleum is the next major energy source after coal in India. Provides: fuel for heat and lighting, lubricants, raw materials for manufacturing. Petroleum refineries act as a “nodal industry” for synthetic textile, fertiliser and numerous chemical industries.
Most petroleum in India is associated with anticlines and fault traps in rock formations of tertiary age. In anticlines/domes, oil is trapped in the crest of the upfold. Gas, being lighter, usually occurs above the oil.
| Region | Key Fields | Note |
|---|---|---|
| Mumbai High | Offshore (west coast) | Major offshore production area |
| Gujarat | Ankeleshwar (most important field of Gujarat), Kalol, Vadodara, Ankaleshwar, Hajira | – |
| Assam | Digboi, Naharkatiya, Moran-Hugrijan | Oldest oil producing state of India |
12. Conventional Energy – Natural Gas
Found with petroleum deposits; released when crude oil is brought to the surface. Uses: domestic and industrial fuel; power sector (electricity); heating; raw material in chemical, petrochemical and fertilizer industries; transport fuel (CNG); cooking fuel (PNG).
| Gas Reserve / Basin | Location |
|---|---|
| Mumbai High and allied fields | West coast |
| Cambay basin | Gujarat (supplement to Mumbai High) |
| Krishna-Godavari basin | East coast — new reserves discovered |
📗 HVJ Pipeline (NCERT – Frequently Asked)
The first 1,700 km long Hazira-Vijaipur-Jagdishpur (HVJ) cross-country gas pipeline was constructed by GAIL (India). It linked Mumbai High and Bassein gas fields with fertilizer, power and industrial complexes in western and northern India. India’s gas infrastructure has expanded from 1,700 km to 18,500 km of cross-country pipelines and is expected to reach over 34,000 km as Gas Grid linking all gas sources and consuming markets including north-eastern states.
13. Conventional Energy – Electricity
Per-capita electricity consumption is considered an index of development. Electricity is generated in two main ways:
| Type | Source | Nature | Examples |
|---|---|---|---|
| Hydro Electricity | Fast flowing water driving hydro turbines | Renewable resource | Bhakra Nangal, Damodar Valley Corporation, Kopili Hydel Project |
| Thermal Electricity | Coal, petroleum and natural gas driving turbines | Non-renewable fossil fuels | Thermal power stations across India |
14. Non-Conventional Sources of Energy
🔵 Why Non-Conventional?
Rising fossil fuel prices, potential shortages, security of energy supply concerns, and serious environmental problems from fossil fuels — all necessitate a shift to renewable non-conventional sources.
| Source | Key Facts | Location / Status |
|---|---|---|
| Nuclear / Atomic Energy | Obtained by altering atomic structure → releases heat → generates electricity. Uranium and Thorium used. | Uranium & Thorium: Jharkhand and Aravalli ranges (Rajasthan); Monazite sands of Kerala — rich in Thorium. Nuclear plants: Naraura (UP), Rawat Bhata (Rajasthan), Tarapur (Maharashtra), Kakrapara (Gujarat), Kaiga (Karnataka), Kalpakkam (TN) |
| Solar Energy | Photovoltaic technology converts sunlight directly into electricity. India is a tropical country with enormous solar potential. | Fast becoming popular in rural and remote areas; big solar plants being established across India |
| Wind Power | India has great potential for wind power. | Largest wind farm cluster: Tamil Nadu (Nagarcoil to Madurai). Also AP, Karnataka, Gujarat, Kerala, Maharashtra, Lakshadweep. Nagarcoil and Jaisalmer — well known for effective wind energy use. |
| Biogas | Shrubs, farm waste, animal and human waste used; organic matter decomposition yields gas. Higher thermal efficiency than kerosene, dung cake, charcoal. Gobar gas plants in rural India. Twin benefits: energy + improved quality of manure. | Municipal, cooperative and individual levels; most efficient use of cattle dung |
| Tidal Energy | Floodgate dams trap tidal water; water flows back through turbines. Suitable locations have large tidal range. | Gulf of Khambhat, Gulf of Kuchchh (Gujarat) and Gangetic delta, Sunderban (West Bengal) |
| Geothermal Energy | Earth grows hotter with depth. Groundwater absorbs heat from rocks → steam → drives turbines. Several hundred hot springs in India. | Two experimental projects: Parvati valley near Manikaran (Himachal Pradesh) and Puga Valley, Ladakh |
India: Distribution of Nuclear and Thermal Power Plants (NCERT)
📌 Conservation of Energy – Key Quote (NCERT)
India is presently one of the least energy efficient countries in the world. The twin planks of sustainable energy are: promotion of energy conservation + increased use of renewable energy sources. Citizens can help by using public transport, switching off electricity when not in use, using power-saving devices, and non-conventional sources. After all, “energy saved is energy produced.”
15. NCERT Exercise Answers + Crossword Solutions
MCQ Answers
- Mineral formed by decomposition of rocks, leaving residual weathered material: (b) Bauxite
- Koderma, Jharkhand — leading producer of: (b) Mica
- Minerals deposited in strata of: (a) Sedimentary rocks
- Monazite sand contains: (c) Thorium
Crossword Answers (NCERT Activity)
| Direction | # | Clue | Answer |
|---|---|---|---|
| Across | 1 | A ferrous mineral (9) | MANGANESE |
| Across | 2 | Raw material for cement industry (9) | LIMESTONE |
| Across | 3 | Finest iron ore with magnetic properties (9) | MAGNETITE |
| Across | 4 | Highest quality hard coal (10) | ANTHRACITE |
| Across | 5 | Aluminium is obtained from this ore (7) | BAUXITE |
| Across | 6 | Khetri mines are famous for this mineral (6) | COPPER |
| Across | 7 | Formed due to evaporation (6) | GYPSUM |
| Down | 1 | Found in placer deposit (4) | GOLD |
| Down | 2 | Iron ore mined in Bailadila (8) | HEMATITE |
| Down | 3 | Indispensable for electrical industry (4) | MICA |
| Down | 4 | Geological Age of coal in north-east India (8) | TERTIARY |
| Down | 5 | Formed in veins and lodes (3) | TIN |
📝 Practice MCQs – UPSC / State PCS Standard
Q1. Magnetite iron ore has iron content of up to 70%. Which port is used to export iron ore from Bailadila, Chhattisgarh?
- A. Marmagao
- B. Paradwip
- C. Vishakhapatnam
- D. Chennai
✅ Answer: C | Bailadila iron ore (Durg-Bastar-Chandrapur belt) is exported to Japan and South Korea via Vishakhapatnam port. Marmagao port is used for Maharashtra-Goa belt iron ore.
Q2. Kudremukh iron ore mines in Karnataka are significant because:
- A. They are the largest iron ore mines in Asia
- B. They are a 100% export unit and one of the largest deposits in the world; ore transported as slurry via pipeline to Mangaluru
- C. They export through Marmagao port
- D. They supply iron ore to the Bhilai steel plant
✅ Answer: B | Kudremukh mines are in Western Ghats of Karnataka — 100% export unit; ore transported as slurry through a pipeline to a port near Mangaluru.
Q3. Which of the following is NOT a use of manganese?
- A. Manufacturing of steel
- B. Ferro-manganese alloy
- C. Bleaching powder and insecticides
- D. Raw material for cement industry
✅ Answer: D | Limestone is the raw material for cement industry, not manganese. Manganese is used in steel (10 kg per tonne), ferro-manganese alloy, bleaching powder, insecticides and paints.
Q4. The HVJ (Hazira-Vijaipur-Jagdishpur) gas pipeline was constructed by GAIL. What was the original length of this first cross-country gas pipeline?
- A. 800 km
- B. 1,200 km
- C. 1,700 km
- D. 2,500 km
✅ Answer: C | The first HVJ pipeline was 1,700 km long, linking Mumbai High and Bassein gas fields with industrial complexes in western and northern India. India’s gas pipeline network has since grown to 18,500 km.
Q5. Two experimental geothermal energy projects have been set up in India. Where are they located?
- A. Jaisalmer and Kochi
- B. Nagarcoil and Manikaran
- C. Parvati valley near Manikaran (HP) and Puga Valley (Ladakh)
- D. Gulf of Khambhat and Sunderban
✅ Answer: C | NCERT explicitly names Parvati valley near Manikaran in Himachal Pradesh and Puga Valley in Ladakh as the two experimental geothermal energy projects in India.
Q6. Monazite sands of Kerala are rich in which element used for nuclear energy?
- A. Uranium
- B. Plutonium
- C. Thorium
- D. Radium
✅ Answer: C | Uranium and Thorium are used for nuclear power. Uranium & Thorium are found in Jharkhand and Aravalli ranges of Rajasthan. Monazite sands of Kerala are specifically rich in Thorium.
Q7. The largest wind farm cluster in India is located in Tamil Nadu. Between which two cities does it stretch?
- A. Chennai to Coimbatore
- B. Nagarcoil to Madurai
- C. Jaisalmer to Jodhpur
- D. Nagarcoil to Thiruvananthapuram
✅ Answer: B | The largest wind farm cluster is in Tamil Nadu from Nagarcoil to Madurai. Nagarcoil and Jaisalmer are well known for effective use of wind energy in the country.
Q8. Rat-hole mining in Meghalaya has been declared illegal by which authority?
- A. Supreme Court of India
- B. Ministry of Environment, Forest and Climate Change
- C. National Green Tribunal (NGT)
- D. Coal India Limited
✅ Answer: C | The National Green Tribunal declared rat-hole mining (long narrow tunnels) in Meghalaya’s Jowai and Cherapunjee illegal and recommended it be stopped forthwith.
Q9. Which of the following areas provides ideal conditions for tidal energy in India?
- A. Gulf of Khambhat only
- B. Puga Valley and Sunderban
- C. Gulf of Khambhat, Gulf of Kuchchh (Gujarat) and Gangetic delta in Sunderban (WB)
- D. Lakshadweep and Andaman & Nicobar
✅ Answer: C | NCERT lists three tidal energy ideal locations: Gulf of Khambhat, Gulf of Kuchchh (both in Gujarat on west coast) and Gangetic delta in Sunderban (West Bengal).
Q10. Consider these statements about coal in India:
1. Gondwana coal is about 200 million years old and is the source of metallurgical coal.
2. Tertiary coal occurs in north-eastern states — about 55 million years old.
3. Lignite reserves in Neyveli, Tamil Nadu are used for electricity generation.
Which are correct?
1. Gondwana coal is about 200 million years old and is the source of metallurgical coal.
2. Tertiary coal occurs in north-eastern states — about 55 million years old.
3. Lignite reserves in Neyveli, Tamil Nadu are used for electricity generation.
Which are correct?
- A. 1 and 2 only
- B. 2 and 3 only
- C. 1, 2 and 3
- D. 1 and 3 only
✅ Answer: C | All three are directly stated in NCERT. Gondwana coal (metallurgical, ~200 MY) in Damodar valley. Tertiary coal (~55 MY) in Meghalaya, Assam, Arunachal, Nagaland. Lignite at Neyveli, Tamil Nadu for electricity.
