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Graphite is a type of mineral found in metamorphic and igneous rocks. It is usually formed when carbon is subjected to high temperature and pressure in the earth&#;s crust. Graphite is also said to be one of the naturally-occurring forms of crystalline carbon. However, this mineral is an interesting one and is commonly referred to as the mineral of all extremes.
As such, Graphite is soft in nature, it cleaves easily even with light pressure, is greasy and features low specific gravity. Further, this mineral has a black or sometimes greyish colour. It is an excellent conductor of electricity or heat and it can also withstand extreme temperatures. Another significant character of this mineral is that it is chemically inert meaning it is not affected by a majority of reagents and acids.
Graphite is found all over the world in its natural form, and in high quantities as well. However, it is usually classified into three forms namely flake, crystalline, and amorphous depending on the source of the mineral.
Graphite has been used since ancient times. It has a wide range of applications in the modern world too. Let&#;s look at some common uses of graphite below.
The word graphite is from the Greek language which translates as &#;to write&#;. So the most common use of graphite is in making the lead in pencils. This lead is a mixture of clay and graphite which is in an amorphous form.
Graphite is one of the main ingredients in lubricants like grease, etc. This mineral reacts with atmospheric water vapour and creates a thin film or layer over the surface applied and thus reduces friction. Graphite is also used in car brakes and clutches.
The powdered form of lump graphite is also used in paints. Why? Well, graphite by nature is water-repellent. So it offers a protective coating on wood and other surfaces.
Due to its high tolerance to heat and unchangeability, Graphite is a widely used refractory material. It finds its use in the manufacturing industry and it helps in the production of glass and steel as well as processing of iron.
Graphite can absorb fast-moving neutrons. As a result, it is used in reactors to stabilize nuclear reactions.
Crystalline flake graphite is used in the manufacturing of carbon electrodes, brushes, and plates needed in dry cell batteries and the electrical industry. Interestingly, natural graphite is also processed into synthetic graphite. This type of graphite is useful in lithium-ion batteries.
Graphite can be used to make graphene sheets. These sheets are said to be 100 times stronger and 10 times lighter than steel. This derivative of graphite is further used in making lightweight and strong sports equipment. Many are considering future applications in the field of medical and aerospace industry.
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Frequently Asked Questions &#; FAQs
Q1
This slippery-sheet form is what makes the touch of graphite so sloppy and makes it such a strong writing content. The particles of the carbon sheet readily rub off the pencil centre and onto the page. This property also makes it an excellent dry lubricant for graphite powder.
Q2
In pencils and lubricants, graphite is used. It is a strong heat and energy conductor. In electrical devices such as electrodes, batteries, and solar panels, its high conductivity makes it useful.
Q3
A type of carbon, which is an element, is graphite. The carbon atoms are bound together in graphite and organised into layers. On the right hand of the periodic table, you will find non-metals, and graphite is the only non-metal that is a strong electricity conductor.
Q4
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Every carbon atom is covalently bound to four other carbon atoms at the four corners of the tetrahedron. A simultaneous piling of layers of carbon atoms amounts to the crystal structure of graphite. The carbon atoms lie in fused hexagonal rings inside each layer, which stretch infinitely in two dimensions.
Q5
In a graphite molecule, each carbon atom&#;s valence electron stays secure, making graphite a strong electricity conductor.
These are some top uses of graphite. To know more about the properties and different types of rocks and minerals you can keep visiting BYJU&#;S or download our app for interesting content and learning experience.
Back to Rocks and Minerals Articles
Graphite is an opaque, non-metallic carbon polymorph that is blackish silver in colour and metallic to dull in sheen. Since it resembles the metal lead, it is also known colloquially as black lead or plumbago.
Graphite is most often found as flakes or crystalline layers in metamorphic rocks such as marble, schist&#;s and gneisses. Graphite may also be found in organic-rich shale&#;s and coal beds. In these cases, the graphite itself probably resulted from metamorphosis of dead plant and animal matter. Graphite is also found in veins and sometimes in basalt. Graphite also occurs in meteorites.
Graphite consists of a ring of six carbon atoms closely bonded together hexagonally in widely spaced layers. The bonds within the layers are strong but the bonds between the layers are less in number and therefore are weaker. Graphite is the stable form of carbon &#; diamonds at or near the Earth&#;s surface are gradually changing to graphite. Fortunately this process is extremely slow.
Diamond is another carbon polymorph; although composed of the element carbon, like graphite, diamond does not have much else in common. Each has a lot of contrasting properties. For instance, diamond is the hardest mineral, but graphite is one of the softest. Diamond is usually transparent, but graphite is opaque. Also, diamond is often used as an abrasive, whereas graphite makes a good lubricant. Graphite is an excellent conductor of electricity, while diamond makes a good electrical insulator.
Named in by the German chemist and mineralogist A.G. Werner, the name for graphite is derived from the Greek Word graphein, which means: to write. The name therefore denotes the primary use of graphite as an ingredient used to make the lead for writing pencils.
Graphite was first discovered in Cumbria in North England at the beginning of the sixteenth century. Although it resembled coal, it would not burn. It did, however, prove to be an excellent marker of sheepskins.
The government of England took charge of the mining operations of graphite when it was discovered that it also served as an excellent mould for cannonball production. As such, the value of graphite increased dramatically in a short period of time. During the reign of Queen Elizabeth I, graphite was transported to the capital under cover of the local guard.
Dubbed &#;Wad&#; by the locals, graphite soon became a precious commodity. In , the government made the stealing and trade of stolen graphite a criminal offence, punishable by hard labour or transportation.
The first documented use of graphite as a pencil occurred in . The use of graphite as an art material became popular, sold by Flemish merchants throughout Europe. At first, pencils consisted of rough pieces of graphite wrapped in sheepskin. The Italians first began using pencils that consisted of pieces of graphite embedded in wood.
In the early days of pencil making, a small cottage industry started in Keswick, England making artists&#; pencils. These were all made by hand and the method was briefly as follows:
A piece of Cumberland Graphite was cut into slabs. A square groove was then carved into a piece of wood. The slab of graphite was inserted in the groove; the graphite was then broken off, so that it was level with the top of the groove; a thin slat of wood covered the graphite, leaving the graphite encased.
This wood was shaped by hand-plane and the shape of the knife in plain determined the shape of the pencil, round, oval, etc, and all this work was carried out by hand. Later, small primitive types of lathes were introduced which were foot-operated with a treadle similar to a treadle sewing machine and all the shaping was done in this manner. All the pencils were hand-made; many families in Keswick made these pencils in their cottages, the origin of the pencil industry.
In the mid-eighteenth century, the relationship between Britain and France deteriorated. As a result, supplies of graphite from England to France dried up. In , the French artist Conte discovered that graphite could be mixed with clay to produce pencils with varying degrees of hardness. In the mid- s, the pencil making industry in Keswick had started to set up factories; it turned more and more to the use of powdered graphite mixed with powdered clay to make pencils.
This mine was famous for producing graphite that did not come from bedded shale&#;s or embedded in rock but was associated with an igneous intrusion connected to a hydrothermal vein that contained wads of graphite along it. The mineral was found along a 400 m stretch of the vein in lumps and nodules. A market for it opened up around the end of the sixteenth century. German miners from Keswick in the early sixteenth century had made more progress mining the graphite from this site.
Lots of graphite could be mined in a short period of time with little expense so in order to maintain the sale value of the graphite, the owners of the mine agreed not to reopen it for a certain period of time. As a result, stealing of graphite, or &#;wad&#; as they called it at the time, became quite common. For that reason, a security lodge was built outside the upper part of the mine, with an armed guard to keep watch over the mine day and night. In the s, the mine briefly reopened but only eight workmen were chosen to mine it. Several times each day the miner&#;s pockets were checked by six different overseers, to make sure they were not stealing any wad while mining it.
In , the Grand Pipe was finally dewatered, which opened other parts of the mine, which could be used for the extraction of graphite. Workmen continued to mine the cave for graphite and three years later, their efforts were rewarded by the surprisingly late discovery of a large accumulation of wad known as Dixon&#;s Pipe.
Canada&#;s first graphite mine was the Miller (Keystone) mine, Grenville, Quebec.
Graphite is found primarily among the rocks of the Precambrian Grenville Province of Eastern Ontario.
In graphite was discovered on the shore of Whitefish Lake, Renfrew County. This later became Ontario`s richest graphite mine, the Black Donald Mine. The graphite mine location is now under the waters of Black Donald Lake. People may visit the town site by scuba diving.
Graphite was mined at the National Graphite Mine, Graphite, Monteagle Township, near Bancroft. The mine operated from to .
Graphite spheres embedded in crystalline calcite were found exposed by a road cut on Halliburton County road about 3.6 km south of Goderham, Ontario, Canada.
The mine Cesky Krumlov was the first discovered around 500 BC in Southern Bohemia on the outskirts of the small village of Cesky Krumlov. The graphite was mined by the Celts as an additive to ceramics. The first modern mining of graphite took place around the middle of the 18th century. The mine became famous for its rich deposits of graphite with layers that were about 1 metre &#; 20 metres in thickness and extended for, at times, over one kilometre.
During the mid-eighteenth century, graphite first began to be mined by modern methods at Cesky Krumlov. Other Graphite Mines were formed nearby. The presence of lots of highly metamorphosed rocks such as gneisses were found along the two rivers known as the Danube and the Vitaca (which was called the Moldau in German). The entire geologic structure was thus dubbed the moldanubic crystallinicum as it incorporates the names of both rivers and refers to the crystalline structure of the gneisses found there that contain graphite.
*Note this article was originally printed in March . Some of the resources had to be removed as the links were no longer in service.
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