Graphite and Diamond
Geography › Mineral and Energy Resources · Topic 21.13
Graphite and diamond are two forms of pure carbon with opposite properties: graphite is soft, slippery and conducts electricity, while diamond is the hardest natural substance. Graphite is used in refractories, lubricants, pencils and battery anodes, and China produces most of it. Diamonds come from kimberlite pipes and alluvial gravels; Russia, Botswana and Canada lead. India's only working diamond mine is at Panna in Madhya Pradesh, but Surat is the world's main centre for cutting diamonds.
5 min read · UPSC Prelims · Geography · Mineral and Energy Resources
At a Glance
- Carbon forms Graphite soft; diamond hardest
- Graphite leader China
- Diamond leaders Russia, Botswana, Canada
- Indian mine Panna, Madhya Pradesh
- Cutting hub Surat, Gujarat
- Exam link UPSC Prelims, Geography: Mineral and Energy Resources
Where Does It Fit?
This is the thirteenth topic of the macro on mineral and energy resources. The previous topic covered lithium and rare earths, and this one covers two forms of carbon, one of which is also a battery material. The next topic covers limestone, dolomite and magnesite. Previous topic: Lithium and Strategic Minerals. Next topic: Limestone, Dolomite and Magnesite.
How Do Graphite and Diamond Differ?
| Feature | Graphite | Diamond |
|---|---|---|
| Structure | Carbon atoms in flat layers that slide over each other | Carbon atoms in a rigid three-dimensional network |
| Properties | Soft, greasy, black, a good conductor of electricity and heat, with a very high melting point | The hardest natural material, transparent, an electrical insulator, and a good conductor of heat |
| Formation | In metamorphic rocks such as marble, schist and gneiss, from heated organic matter, and in veins | Deep in the mantle, at high pressure and temperature, brought up in volcanic kimberlite pipes; also in gravels where rivers have deposited them |
| Uses | Refractories and crucibles, steelmaking, lubricants, pencils, brake linings, nuclear reactor moderators, and anodes of lithium-ion batteries | Jewellery, and industrial uses for cutting, drilling and grinding |
Such different forms of one element are called allotropes. Graphite has become a critical mineral because every lithium-ion battery needs a graphite anode, and a typical electric vehicle battery has tens of kilograms, as in Lithium and Strategic Minerals.
Where Is Graphite Found?
- World: China is the largest producer by far and also dominates the processing of battery-grade graphite, followed by Madagascar, Mozambique and Brazil. China tightened export controls on graphite in 2023.
- India: the resource is mainly in Arunachal Pradesh, with deposits in the Bomdila and Tawang area, and also in Jharkhand (Palamu), Odisha (Kalahandi, Bolangir), Tamil Nadu (Sivaganga), Kerala and Karnataka. Production has been small, and India imports graphite and graphite electrodes, though the Geological Survey of India reports large resources of low-grade graphite. Because of its importance for batteries, graphite is on the critical minerals list. Graphite occurs in two main forms for industry: flake graphite, which is used in batteries and refractories, and amorphous graphite, which is of lower grade and used in foundries and for lubricants. Synthetic graphite made from petroleum coke is also used for electrodes in electric arc furnaces and for part of the battery anode supply.
Where Are Diamonds Found, Cut and Traded?
| Place | Details |
|---|---|
| World mines | Russia (Yakutia, ALROSA) is the largest by volume, Botswana (Jwaneng, Orapa) the largest by value, followed by Canada, the Democratic Republic of the Congo, South Africa (Kimberley, where the first major finds were made in the 1860s), Angola and Zimbabwe; the Argyle mine in Australia closed in 2020 |
| Panna, Madhya Pradesh | The Majhgawan kimberlite pipe, worked by NMDC, is Asia’s only mechanised diamond mine and India’s only large producer; Panna and Chhatarpur districts also have the Bundelkhand diamond belt |
| Other Indian sites | Historic Golconda in Andhra Pradesh and Telangana, where the Kohinoor and Hope diamonds were found; the Krishna river gravels near Kollur; Behradih and Payalikhand in Chhattisgarh |
| Cutting centre | Surat in Gujarat cuts and polishes most of the world’s diamonds by number, supported by Mumbai as the trading hub; India imports rough stones and exports polished diamonds as part of its gems and jewellery sector |
India’s own diamond output is only a few tens of thousands of carats a year. Its role is in the processing and export of polished stones, and more recently in laboratory-grown diamonds, which Surat’s industry has taken up, backed by research support announced in 2023. Lab-grown diamonds are chemically the same as natural stones but cheaper, and their growth has pushed down the prices of natural stones.
As an analytical point, graphite and diamond show two paths for a mineral: graphite’s value lies in its role in the battery chain, so the competition is over processing capacity, while diamond’s value lies in cutting, branding and trade, in which India has a lead without owning large mines. In both cases, access to rough material and technology, not geology at home, decides the benefit, as in Mining and Quarrying.
Why Is This Topic Important?
- Concepts Allotropes asked
- Map-based Panna and Golconda
- Link Battery graphite
What Came Next?
The next topic describes limestone, dolomite and magnesite. Next topic: Limestone, Dolomite and Magnesite.
Key People and Terms
- Allotrope Different form of one element
- Kimberlite Diamond-bearing volcanic rock
- Carat Diamond weight unit, 0.2 gram
- Anode Battery negative electrode
- Majhgawan Panna diamond pipe
- Lab-grown diamond Synthetic gem diamond
Exam Corner
Points to Remember
- Graphite and diamond are allotropes of carbon.
- Diamonds come up in kimberlite pipes.
- Panna is India’s main diamond mine.
- Surat cuts and polishes diamonds.
- Battery anodes use graphite.
Do Not Confuse With
- Graphite and diamond Soft conductor versus hard insulator
- Panna and Golconda Working mine versus historic source
- Natural and lab-grown diamond Mined versus made, chemically the same
Memory Hook
One carbon, two faces: layers for graphite, a lattice for diamond; Panna digs, Surat cuts.
Mains Angle
Questions ask for properties, distribution and trade. These points add depth.
- Contrast Allotropes
- Place Few producers
- India Cutting hub, battery need
A Question You May Face
An original practice question, not a past paper question.
“Compare graphite and diamond and discuss why India is a major diamond-processing centre despite its small diamond mining.”
How to Answer
- Carbon Allotropes compared.
- World Graphite and diamond regions.
- India Panna and Golconda.
- Trade Surat and lab-grown.
GS Relevance
Frequently Asked Questions
How are graphite and diamond different?
Both are pure carbon but have different atomic structures. In graphite the atoms are in flat layers that slide easily, so it is soft and conducts electricity. In diamond the atoms form a rigid three-dimensional network, making it the hardest natural material and an electrical insulator.
Where is diamond mined in India?
India's main working diamond mine is the Majhgawan kimberlite pipe at Panna in Madhya Pradesh, run by NMDC. Historic sources were Golconda in Andhra Pradesh and Telangana and the Krishna river gravels, and some deposits are found in Chhattisgarh. Total output is small.
What is kimberlite?
Kimberlite is an igneous rock that forms in volcanic pipes, which bring material from deep in the mantle to the surface, and is the main primary source of diamonds. It is named after Kimberley in South Africa, where the first major diamond finds were made in the nineteenth century.
Why is Surat important for diamonds?
Surat in Gujarat is the world's leading centre for cutting and polishing diamonds, which employs hundreds of thousands of workers. India imports rough diamonds and exports polished stones, so it gains value from processing even though its own mines produce little.
Why is graphite important for batteries?
Graphite is used as the material for the anode, the negative electrode, of lithium-ion batteries, so each electric vehicle needs tens of kilograms of it. China produces and processes most graphite, so graphite is treated as a critical mineral by India and other countries.
PYQ Practice — Statement Analysis
1 Graphite and diamond are allotropes of carbon.
Both are pure carbon.
2 Panna in Madhya Pradesh has India's main diamond mine.
The Majhgawan pipe.
3 Diamond is a good conductor of electricity like graphite.
Diamond is an insulator.
4 Surat is the leading diamond-cutting centre.
In Gujarat.
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