Graphite 12366 225539738 2008-07-14T05:48:10Z SmackBot 433328 Date the maintenance tags or general fixes {{otheruses}} {{Infobox mineral | name = Graphite | category = Native [[mineral]] | boxwidth = | boxbgcolor = | image = GraphiteUSGOV.jpg | imagesize = | caption = Graphite specimen | formula = [[Carbon]], C | molweight = | color = Steel black, to gray | habit = Tabular, six-sided [[Foliation (geology)|foliated]] masses, granular to compacted masses | system = [[Hexagonal (crystal system)|Hexagonal]] (6/m 2/m 2/m) | twinning = | cleavage = Perfect in one direction | fracture = Flaky, otherwise rough when not on cleavage | mohs = 1 - 2 | luster = metallic, earthy | refractive = Opaque | opticalprop = | birefringence = | pleochroism = None | streak = Black | gravity = | density = 2.09&ndash;2.23 g/cm³ | resistivity = 1 ohm/inch | fusibility = | diagnostic = | solubility = Molten Ni | diaphaneity = | other = }} The [[mineral]] '''graphite''', as with [[diamond]] and [[fullerene]], is one of the [[allotropes of carbon]]. It was named by [[Abraham Gottlob Werner]] in 1789 from the [[Greek language|Greek]] γραφειν (graphein): "to draw/write", for its use in [[pencil]]s, where it is commonly called '''lead''', as distinguished from the actual metallic element [[lead]]. Unlike diamond, graphite is an [[electrical conductor]], and can be used, for instance, in the [[electrodes]] of an [[arc lamp]]. Graphite holds the distinction of being the most stable form of carbon under [[standard conditions]]. Therefore, it is used in thermochemistry as the [[standard state]] for defining the [[standard enthalpy of formation|heat of formation]] of carbon compounds. Graphite may be considered the highest grade of [[coal]], just above [[anthracite]] and alternatively called meta-anthracite, although it is not normally used as fuel because it is hard to ignite. There are three principal types of natural graphite, each occurring in different types of ore deposit: (1) Crystalline flake graphite (or flake graphite for short) occurs as isolated, flat, plate-like particles with hexagonal edges if unbroken and when broken the edges can be irregular or angular; (2) Amorphous graphite occurs as fine particles and is the result of thermal metamorphism of coal, the last stage of coalification, and is sometimes called meta-anthracite. Very fine flake graphite is sometimes called amorphous in the trade; (3) Lump graphite (also called vein graphite) occurs in fissure veins or fractures and appears as massive platy intergrowths of fibrous or acicular crystalline aggregates, and is probably hydrothermal in origin. The name "graphite fiber" is also sometimes used to refer to [[carbon fibre]] or [[carbon fibre reinforced plastic]]. == Occurrence == [[Image:GraphiteOreUSGOV.jpg|thumb|left|Graphite ore]] [[Image:2005graphite.PNG|thumb|left|Graphite output in 2005]] Minerals associated with graphite include [[quartz]], [[calcite]], [[mica]]s, [[iron]] [[meteorite]]s, and [[tourmaline]]s. China is usually the top producer of graphite, followed by India and Brazil. Graphite has various other characteristics. Thin flakes are flexible but inelastic, the mineral can leave black marks on hands and paper, it conducts electricity, and displays [[superlubricity]]. Its best field indicators are softness, luster, density and streak. According to the [[USGS]], world production of natural graphite in 2006 was 1.03 million tonnes and in 2005 was 1.04 million tonnes (revised), of which the following major exporters produced: China produced 720,000 tonnes in both 2006 and 2005, Brazil 75,600 tonnes in 2006 and 75,515 tonnes in 2005 (revised), Canada 28,000 tonnes in both years, and Mexico (amorphous) 12,500 tonnes in 2006 and 12,357 tonnes in 2005 (revised). In addition, there are two specialist producers: Sri Lanka produced 3,200 tonnes in 2006 and 3,000 tonnes in 2005 of lump or vein graphite, and Madagascar produced 15,000 tonnes in both years, a large portion of it "crucible grade" or very large flake graphite. Some other producers produce very small amounts of "crucible grade". According to the [[USGS]], U.S. (synthetic) graphite electrode production in 2006 was 132,000 tonnes valued at $495 million and in 2005 was 146,000 tonnes valued at $391 million, and high-modulus graphite (carbon) fiber production in 2006 was 8,160 tonnes valued at $172 million and in 2005 was 7,020 tonnes valued at $134 million. <gallery> Image:Graphite-unit-cell-3D-balls.png|<center>graphite's [[crystal structure#Unit cell|unit cell]]</center> Image:Graphite-sheet-3D-balls.png|<center>[[ball-and-stick model]] of a graphite layer</center> Image:Graphite-layers-side-3D-balls.png|<center>side view of layer stacking</center> Image:Graphite-layers-top-3D-balls.png|<center>plane view of layer stacking</center> </gallery> ==Detailed properties== The two known forms of graphite, ''alpha'' (hexagonal) and ''beta'' ([[rhombohedron|rhombohedral]]), have very similar physical properties (except that the [[graphene]] layers stack slightly differently).<ref>http://prola.aps.org/pdf/PRB/v67/i2/e024107</ref> The hexagonal graphite may be either flat or buckled.<ref>.W.G. Wyckoff, "Crystal Structures" 2 volumes , John Wiley & Sons, New York, London, 1963-4.</ref> Another form called cubic might have also been discovered.<ref>[http://cat.inist.fr/?aModele=afficheN&cpsidt=16674203 Cat.Inist<!-- Bot generated title -->]</ref> Graphites that naturally occur have been found to contain up to 30% of the beta form, when synthetically-produced graphite only contains the alpha form.{{Fact|date=November 2007}} The alpha form can be converted to the beta form through mechanical treatment and the beta form reverts to the alpha form when it is heated above 1000 °[[Celsius|C]].{{Fact|date=November 2007}} The [[Acoustics|acoustic]] and [[thermal]] properties of graphite are highly [[anisotropic]], since [[phonons]] propagate very quickly along the tightly-bound planes, but are slower to travel from one plane to another. Graphite can [[electrical conduction|conduct electricity]] due to the vast [[electron]] [[delocalization]] within the carbon layers. These valence electrons are free to move, so are able to conduct electricity. However, the electricity is only conducted within the plane of the layers. Graphite and graphite powder is valued in industrial applications for its self-lubricating and dry [[lubricant|lubricating]] properties. There is a common belief that graphite's lubricating properties are solely due to the [[cleavage (crystal)|loose interlamellar coupling]] between sheets in the structure. However, it has been shown that in a [[vacuum]] environment (such as in technologies for use in [[Outer space|space]]), graphite is a very poor lubricant. This observation led to the discovery that the lubrication is due to the presence of fluids between the layers, such as air and water, which are naturally [[adsorbed]] from the environment. This molecular property is unlike other layered, dry lubricants such as [[molybdenum disulfide]]. Recent studies suggest that an effect called [[superlubricity]] can also account for graphite's lubricating properties. The use of graphite is limited by its tendency to facilitate [[pitting corrosion]] in some [[stainless steel]]s, and to promote galvanic [[corrosion]] between dissimilar metals (due to its electrical conductivity). It is also corrosive to aluminium in presence of moisture. For this reason, the [[US Air Force]] banned its use as a lubricant in aluminium aircraft <ref>[http://www.graflex.org/speed-graphic/lubricants.html Better Lubricants than Graphite<!-- Bot generated title -->]</ref>, and discouraged its use in aluminium-containing automatic weapons <ref>[http://gojackarmy.blogspot.com/2005/09/weapons-lubricant-in-desert.html Jack Army<!-- Bot generated title -->]</ref>. Even graphite [[pencil]] marks on aluminium parts may facilitate corrosion <ref>[http://7faq.com/owbase/ow.asp?GoodEngineeringPractice%2FCorrosion Good Engineering Practice/Corrosion - L o t u s S e v e n C l u b<!-- Bot generated title -->]</ref>. Another high-temperature lubricant, [[boron nitride|hexagonal boron nitride]], has the same molecular structure as graphite. It is sometimes called ''white graphite'', due to its similar properties. When a large number of crystallographic defects binds these planes together, graphite loses its lubrication properties and becomes what is known as [[pyrolytic carbon]]. This material is useful for blood-contacting implants such as [[prosthetic]] [[heart valve]]s. It is also highly [[diamagnetic]], thus it will float in mid-air above a strong magnet. Graphite forms [[graphite intercalation compound|intercalation compounds]] with some metals and small molecules. In these compounds, the host molecule or atom gets "sandwiched" between the graphite layers, resulting in compounds with variable stoichiometry. A prominent example of an intercalation compound is potassium graphite, denoted by the formula KC<sub>8</sub>. Natural and crystalline graphites are not often used in pure form as structural materials, due to their shear-planes, brittleness and inconsistent mechanical properties. == History == Some time before 1565 (some sources say as early as 1500), an enormous deposit of graphite was discovered on the approach to [[Grey Knotts]] from the hamlet of [[Seathwaite (Borrowdale)|Seathwaite]] near [[Borrowdale|Borrowdale parish]], [[Cumbria, England]], which the locals found very useful for marking sheep.<ref name="norgate">{{cite web |url=http://www.geog.port.ac.uk/webmap/thelakes/html/lgaz/lk00976.htm |title=Old Cumbria Gazetteer, black lead mine, Seathwaite |year=2008 |author=Martin and Jean Norgate, Geography Department, Portsmouth University |accessdate=2008-05-19}}</ref><ref name="wainwright_western">{{cite book|title=A Pictorial Guide to the Lakeland Fells, Western Fells |author=Alfred Wainwright |year=2005 |isbn=0-7112-2460-9 }}</ref> This particular deposit of graphite was extremely pure and solid, and could easily be sawn into sticks. This remains the only deposit of graphite found in this solid form.<ref>{{cite web | title = Pencil | date = 2007-08-07 | url = http://en.wikipedia.org/wiki/Pencil | accessdate = 2007-08-07 }}</ref> ==Uses of natural graphite== According to the [[USGS]], U.S. consumption of natural graphite in 2005-06 averaged 41,850 tonnes in end uses such as refractories, steelmaking, expanded graphite, brake linings, and foundry facings-lubricants. GAN (Graphite Advocate News) import-export statistics for 2006 and 2007 indicate the consumption will continue at that level unless steelmaking carbon raiser takes a drastic drop. ===Refractories=== This end-use begins before 1900 with the graphite [[crucible]] used to hold molten metal; this is now a minor part of [[refractories]]. In the mid 1980s, the carbon-magnesite brick became important, and a bit later the alumina-graphite shape. Currently the order of importance is alumina-graphite shapes, carbon-magnesite brick, monolithics (gunning and ramming mixes), and then crucibles. Crucibles began using very large flake graphite, and carbon-magnesite brick requiring not quite so large flake graphite; for these and others there is now much more flexibility in size of flake required, and amorphous graphite is no longer restricted to low-end refractories. Alumina-graphite shapes are used as continuous casting ware, such as nozzles and troughs, to convey the molten steel from ladle to mould, and carbon magnesite bricks line steel converters and electric arc furnaces to withstand extreme temperatures. High-purity monolithics are often used as a continuous furnace lining instead of the carbon-magnesite bricks. The U.S. and European refractories industry had a crisis in 2000-2003, with an indifferent market for steel and a declining refractory consumption per tonne of steel underlying firm buyouts and many plant closings. Many of the plant closings resulted from the RHI acquisition of Harbison-Walker Refractories; some plants had their equipment auctioned off. Since much of the lost capacity was for carbon-magnesite brick, graphite consumption within refractories area moved towards alumina-graphite shapes and monolithics, and away from the brick. The major source of carbon-magnesite brick is now imports from China. Almost all of the above refractories are used to make steel and account for 75% of refractory consumption; the rest is used by a variety of industries, such as cement. According to the [[USGS]], 2006 U.S. natural graphite consumption in refractories was 11,000 tonnes and in 2005 11,800 tonnes. ===Steelmaking=== Natural graphite in this end use mostly goes into carbon raising in molten steel, although it can be used to lubricate the dies used to extrude hot steel. Supplying carbon raiser is very competitive, therefore subject to cut-throat pricing from alternatives such as synthetic graphite powder, petroleum coke, and other forms of carbon. A carbon raiser is added to increase the carbon content of the steel to the specified level. A GAN consumption estimate based on [[USGS]] U.S. graphite consumption statistics indicates that 10,500 tonnes was used in this fashion in 2005. ===Expanded graphite=== Expanded graphite is made by immersing natural flake graphite in a bath of [[chromic acid]], then concentrated [[sulfuric acid]], which forces the crystal lattice planes apart, thus expanding the graphite. The expanded graphite can be used to make graphite foil or used directly as "hot top" compound to insulate molten metal in a ladle or red-hot steel ingots and decrease heat loss, or as [[firestop]]s fitted around a [[fire door]] or in sheet metal collars surrounding plastic pipe, (During a fire, the graphite expands and chars to resist fire penetration and spread.), or to make high-performance gasket material for high-temperature use. After being made into graphite foil, the foil is machined and assembled into the bipolar plates in [[fuel cells]]. The foil is made into heat sinks for [[laptop computers]] which keeps them cool while saving weight, and is made into a foil laminate that can be used in valve packings or made into gaskets. Old-style packings are now a minor member of this grouping: fine flake graphite in oils or greases for uses requiring heat resistance. A GAN estimate of current U.S. natural graphite consumption in this end use is 7,500 tonnes. ===Brake linings=== Natural amorphous and fine flake graphite are used in brake linings or [[brake shoes]] for heavier (nonautomotive) vehicles, and became important with the need to substitute for [[asbestos]]. This use has been important for quite some time, but nonasbestos organic (NAO) compositions are beginning to cost graphite market share. A brake-lining industry shake-out with some plant closings has not helped either, nor has an indifferent automotive market. According to the [[USGS]], U.S. natural graphite consumption in brake linings was 6,510 tonnes in 2005. ===Foundry facings and lubricants=== A foundry facing or mold wash is a water-based paint of amorphous or fine flake graphite. Painting the inside of a mold with it and letting it dry leaves a fine graphite coat that will ease separation of the object cast after the hot metal has cooled. Graphite [[lubricants]] are specialty items for use at very high or very low temperatures, as a wire die extrusion lubricant, an antiseize agent, a gear lubricant for mining machinery, and to lubricate locks. Having low-grit graphite, or even better no-grit graphite (ultra high purity), is highly desirable. It can be used as a dry powder, in water or oil, or as colloidal graphite (a permanent suspension in a liquid). An estimate based on [[USGS]] graphite consumption statistics indicates that 2,200 tonnes was used in this fashion in 2005. ===Other uses=== Natural graphite has found uses as the marking material ("lead") in common [[pencil]]s, in [[Zinc-carbon battery|zinc-carbon batteries]], in [[electric motor]] brushes, and various specialized applications. ==Uses of synthetic graphite== ===Electrodes=== These electrodes carry the electricity that heats electric arc furnaces, the vast majority steel furnaces. They are made from [[petroleum coke]] after it is mixed with petroleum pitch, extruded and shaped, then baked to sinter it, and then graphitized by heating it above the temperature that converts carbon to graphite. They can vary in size from 6 ft. long to 6 in. in diameter. The graphite electrode market is shrinking: plasma-arc furnaces (no electrodes) are often replacing electric arc furnaces, and the electric arc furnace itself is getting more efficient and making more steel per tonne of electrode. An estimate based on [[USGS]] data indicates that graphite electrode consumption was 197,000 tonnes in 2005. ===Powder and scrap=== The powder is made by heating powdered [[petroleum coke]] above the temperature of graphitization, sometimes with minor modifications. The graphite scrap comes from pieces of unusable electrode material (in the manufacturing stage or after use) and lathe turnings, usually after crushing and sizing. Most synthetic graphite powder goes to carbon raising in steel (competing with natural graphite), with some used in batteries and brake linings. According to the [[USGS]], U.S. synthetic graphite powder and scrap production was 95,000 tonnes in 2001 (latest data). ===Other uses=== Graphite (carbon) fiber and [[carbon nanotube]]s are also used in [[carbon fiber reinforced plastic]]s, and in heat-resistant composites such as [[reinforced carbon-carbon]] (RCC). Products made from carbon fiber graphite composites include [[fishing rod]]s, golf clubs,bicycle frames,and pool sticks and have been successfully employed in [[reinforced concrete]]. The mechanical properties of carbon fiber graphite-reinforced plastic composites and grey [[cast iron]] are strongly influenced by the role of graphite in these materials. In this context, the term "(100%) graphite" is often loosely used to refer to a pure mixture of carbon reinforcement and resin, while the term "composite" is used for [[composite materials]] with additional ingredients. <!--Source: <http://tennis.about.com/od/tennisracquetsfaq/f/faqracquets42.htm> What other ingredients? What entry should "resin" be linked to? --> Synthetic graphite also finds use as a matrix and [[neutron moderator]] within [[nuclear reactor]]s. Its low neutron [[Cross section (physics)|cross section]] also recommends it for use in proposed [[fusion reactor]]s. Care must be taken that reactor-grade graphite is free of neutron absorbing materials such as [[boron]], widely used as the seed electrode in commercial graphite deposition systems-- this caused the failure of the Germans' [[World War II]] graphite-based nuclear reactors. Since they could not isolate the difficulty they were forced to use far more expensive [[heavy water]] moderators. Graphite used for nuclear reactors is often referred to as [[nuclear graphite]]. Graphite has been used in at least three [[radar absorbent material]]s. It was mixed with rubber in Sumpf and Schornsteinfeger, which were used on U-boat snorkels to reduce their [[radar cross section]]. It was also used in tiles on early [[F-117 Nighthawk]]s. Modern gunpowder is coated in graphite to prevent the buildup of static charge. Graphite also has the interesting property that, under certain conditions, it can serve as a form of armor against nuclear weapons. While there is no practical military application for this, graphite is a common material proposed for the pusher plate of a [[Nuclear pulse rocket]]; a space vehicle that propels itself by the ejecting nuclear explosives to the rear and detonating them.{{Fact|date=July 2008}} ==Graphite mining, beneficiation, and milling== Graphite is mined around the world by both open pit and underground methods. While flake graphite and amorphous graphite are both mined open pit and underground, lump (vein) graphite is only mined underground in Sri Lanka. The open pit mines usually employ equipment (i.e. bulldozers) to scoop up the ore, which is usually put in trucks and moved to the plant. Since the original rock is usually lateritized or weathered, this amounts to moving dirt with flecks or pieces of graphite in it from the pit (blasting is seldom required). The underground graphite mines employ drilling and blasting to break up the hard rock (ore), which is then moved by mine cars pulled by a locomotive, or moved by automotive vehicles, to the surface and then to the plant. In less-developed areas of the world, the ore can be mined by pick and shovel and transported by mine cars pushed by a laborer or by women carrying baskets of ore on their heads. Graphite usually needs beneficiation, although thick-bedded amorphous graphite and vein graphite is almost always beneficiated, if beneficiated at all, by laborers hand-picking out the pieces of gangue (rock) and hand-screening the product. The great majority of world flake graphite production is crushed and ground if necessary and beneficiated by flotation. Treating graphite by flotation encounters one big difficulty: graphite is very soft and "marks" (coats) the particles of gangue. This makes the "marked" gangue particles float off with the graphite to yield a very impure concentrate. There are two ways of obtaining a saleable concentrate or product: regrinding and floating it again and again (up to seven times) to obtain a purer and purer concentrate, or by leaching (dissolving) the gangue with hydrofluoric acid (for a silicate gangue) or hydrochloric acid (for a carbonate gangue). In the milling process, the incoming graphite products and concentrates can be ground before being classified (sized or screened), with the coarser flake size fractions (above 8 mesh, 8 mesh to 20 mesh, 20 mesh to 50 mesh) carefully preserved, and then the carbon contents are determined. Then some standard blends can be prepared from the different fractions, each with a certain flake size distribution and carbon content. Custom blends can also be made for individual customers who want a certain flake size distribution and carbon content. If flake size is unimportant, the concentrate can be ground more freely. Typical final products include a fine powder for use as a slurry in [[oil drilling]]; in [[zirconium]] [[silicate]], [[sodium silicate]] and [[isopropyl alcohol]] coatings for [[foundry]] molds; and a carbon raiser in the [[steel]] industry ( Synthetic graphite powder and powdered petroleum coke can also be used as carbon raiser)(Earth Metrics, 1989). Rough graphite is typically classified, ground, and packaged at a graphite mill; often the more complex formulations are also mixed and packaged at the mill facility. Environmental impacts from graphite mills consist of air pollution including fine particulate exposure of workers and also [[soil contamination]] from powder spillages leading to [[heavy metals]] contaminations of soil. Dust masks are normally worn by workers during the production process to avoid worker exposure to the fine airborne graphite and [[zircon]] silicate. ==Graphite recycling== The most common way graphite is recycled occurs when synthetic graphite electrodes (or anodes or cathodes) are either manufactured and pieces are cut off or lathe turnings are discarded, or the electrode (or other) are used all the way down to the electrode holder. A new electrode replaces the old one , but a sizeable piece of the old electrode remains. This is crushed and sized, and the resulting graphite powder is mostly used to raise the carbon content of molten steel. Graphite-containing refractories are sometimes also recycled , but often not because of their graphite: the largest-volume items, such as carbon-magnesite bricks that contain only 15%-25% graphite, usually contain too little graphite. However, some recycled carbon-magnesite brick is used as the basis for furnace repair materials, and also crushed carbon-magnesite brick is used in slag conditioners. While crucibles have a high graphite content, the volume of crucibles used and then recycled is very small. A high-quality flake graphite product that closely resembles natural flake graphite can be made from steelmaking kish. Kish is a large-volume near-molten waste skimmed from the molten iron feed to a basic oxygen furnace, and is a mix of graphite (precipitated out of the supersaturated iron), lime-rich slag, and some iron. The iron is recycled on site, so what is left is a mixture of graphite and slag. The best recovery process uses hydraulic classification (Which utilizes a flow of water to separate minerals by specific gravity: graphite is light and settles nearly last.) to get a 70% graphite rough concentrate. [[Leaching]] this concentrate with hydrochloric acid gives a 95% graphite product with a flake size ranging from 10 mesh down. ==Media== {{multi-video start}} {{multi-video item | filename = graphite stereo animation.gif | title = Graphite animation | description = Rotating graphite [[stereogram]]. (2.79 [[Megabyte|MB]], [[animated GIF]] format). | format = [[animated GIF]] }} {{multi-video end}} ==See also== <div style="-moz-column-count:3; column-count:3;"> * [[Graphite intercalation compound]] * [[Carbon fiber]] * [[Intumescent]] * [[Passive fire protection]] * [[pyrolytic carbon|Pyrolytic graphite]] * [[Diamond]] * [[Lonsdaleite]] * [[Graphene]] * [[Carbon nanotube]] * [[Fullerene]] * [[Pencil]] </div> ==References== {{Reflist}} *C.Michael Hogan, Marc Papineau et al., ''[[Phase I Environmental Site Assessment]], Asbury Graphite Mill, 2426-2500 Kirkham Street, Oakland, California'', Earth Metrics report 10292.001, December 18, 1989 * Klein, Cornelis and Cornelius S. Hurlbut, Jr. (1985) ''Manual of Mineralogy: after Dana'' 20<sup>th</sup> ed. ISBN 0-471-80580-7 *Taylor, Harold A., "Graphite", Financial Times Executive Commodity Reports (London: Mining Journal Books ltd.) 2000 ISBN 1-84083-332-7 *Taylor, Harold A., "Graphite", Industrial Minerals and Rocks, 7th ed. (Littleton, CO AIME-Society of Mining Engineers) 2005 ISBN 0-87335-233-5 == External links == {{Commons|Graphite}} *[http://www.phy.mtu.edu/~jaszczak/graphite.html The Graphite Page] *[http://mineral.galleries.com/minerals/elements/graphite/graphite.htm Mineral galleries] *[http://www.webmineral.com/data/Graphite.shtml Webmineral] *[http://www.mindat.org/show.php?id=1740&ld=1&pho= Mindat w/ locations] *[http://www.chemguide.co.uk/atoms/structures/giantcov.html giant covalent structures] *[http://minerals.usgs.gov/minerals/pubs/commodity/graphite/graphmyb05.pdf USGS 2005 Minerals Yearbook: Graphite] *[http://minerals.usgs.gov/minerals/pubs/commodity/graphite/myb1-2006-graph.pdf USGS 2006 Minerals Yearbook: Graphite] *[http://minerals.usgs.gov/minerals/pubs/commodity/graphite/ Graphite Statistics and Information] - United States Geological Survey minerals information for graphite *[http://videolectures.net/kolokviji_heggie_gnt/ Link to 'Graphite - a New Twist'] - Video lecture by Prof. Malcolm Heggie, University of Sussex. {{Allotropes of carbon}} [[Category:Native element minerals]] [[Category:Lubricants]] [[Category:Art materials]] [[Category:Carbon forms]] [[Category:Refractory materials]] [[Category:Electrical conductors]] [[Category:Recycling]] [[Category:Recyclable materials]] [[ar:غرافيت]] [[be:Графіт]] [[bs:Grafit]] [[bg:Графит]] [[ca:Grafit (mineral)]] [[cs:Grafit]] [[da:Grafit]] [[de:Graphit]] [[et:Grafiit]] [[es:Grafito]] [[eo:Grafito]] [[eu:Grafito]] [[fa:گرافیت]] [[fr:Graphite]] [[gl:Grafito]] [[ko:흑연]] [[hr:Grafit]] [[id:Grafit]] [[is:Grafít]] [[it:Grafite]] [[he:גרפיט]] [[la:Graphitum]] [[lv:Grafīts]] [[lt:Grafitas]] [[jbo:pistabno]] [[lmo:Grafiit]] [[hu:Grafit]] [[nl:Grafiet]] [[ja:グラファイト]] [[no:Grafitt]] [[pl:Grafit]] [[pt:Grafite]] [[ru:Графит]] [[simple:Graphite]] [[sk:Grafit]] [[sl:Grafit]] [[sr:Графит]] [[fi:Grafiitti]] [[sv:Grafit]] [[th:แกรไฟต์]] [[vi:Than chì]] [[tr:Grafit]] [[uk:Графіт]] [[zh:石墨]]