Marble

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For other uses, see Marble (disambiguation).Marble.Taj Mahal, world-famous monument made of marble.Venus de Milo, front.Natural patterns on the polished surface of "landscape marble" can resemble a city skyline or even trees (see photo).Blocks of cut marble at the historic mill in Marble, Colorado.Black D?bnik marble portal (17th century) of St. Wojciech's Church in Krak楂?Marble from Italy.Marble is a nonfoliated metamorphic rock resulting from the metamorphism of limestone, composed mostly of calcite (a crystalline form of calcium carbonate, CaCO3). It is extensively used for sculpture, as a building material, and in many other applications. The word "marble" is colloquially used to refer to many other stones that are capable of taking a high polish.Contents1 Etymology 2 Origins 3 Types of marble 4 Construction marble 5 Industrial use of marble 6 Production 7 Artificial marble 8 Cultural associations 9 See also 10 References 11 External links // EtymologyThe word "marble" derives from the Greek ???????? (marmaron)[1] and that from ???????? (marmaros), "crystalline rock", "shining stone"[2][3], perhaps from the verb ???????? (marmair?), "to flash, sparkle, gleam"[4]. This stem is also the basis for the English word "marmoreal" meaning "marble-like".OriginsMarble is a metamorphic rock resulting from regional or rarely contact metamorphism of sedimentary carbonate rocks, either limestone or dolomite rock, or metamorphism of older marble. This metamorphic process causes a complete recrystallization of the original rock into an interlocking mosaic of calcite, aragonite and/or dolomite crystals. The temperatures and pressures necessary to form marble usually destroy any fossils and sedimentary textures present in the original rock.Pure white marble is the result of metamorphism of very pure limestones. The characteristic swirls and veins of many colored marble varieties are usually due to various mineral impurities such as clay, silt, sand, iron oxides, or chert which were originally present as grains or layers in the limestone. Green coloration is often due to serpentine resulting from originally high magnesium limestone or dolostone with silica impurities. These various impurities have been mobilized and recrystallized by the intense pressure and heat of the metamorphism.Types of marbleSome historically important kinds of marble, named after the locations of their quarries, includeMarbleColorLocationCountry/RegionAegean WhiteWhiteVolosGreeceBeijing WhiteWhiteChinaBlack MarbleBasqueSpainBlack MarbleD?bnikPolandBlack MarbleKilkennyIrelandBoticena and Onyx(Green)PakistanBra?Island of Bra?CroatiaBrown marbleCh?cinyPolandCarrara marblewhite or blue-grayCarraraItalyConnemara marbleGreenConnemaraIrelandDanby marbleDanbyVermontDurango MarbleCoyote QuarryMexicoFauskeNorwayGreen MarbleIndiaKatni MarbleLlano PinkCentral TexasLuni marbleLuniItalyMacaelSpainMakranaGrayish whiteIndiaMalagori WhitePakistanNabresinaTriesteItalyParian marbleFine-grained semitranslucent pure-whiteIsland of ParosGreecePenteli MarbleFlawless white with a uniform, faint yellow tintPenteliGreeceProconnesus MarbleIsland of MarmaraTurkeyRed MarbleRu?chi?aRomaniaRosa EgeoPinkVolosGreeceRouge de RanceRedRanceBelgiumRoyal WhiteWhiteChinaRuskeala Marblewhite, gray, blackRuskealaFinland/RussiaSivec or Macedonian Bianco SivecWhitePrilepRepublic of MacedoniaThassosSnow white, White,Grayish white, White with pink veiningIsland of ThassosGreeceVencac WhiteWhiteArandjelovacSerbiaVietnam WhiteGrayish WhiteVietnamYuleUniform pure whiteMarble, ColoradoColoradoWhite marbles, like Carrara in Italy, Royal White and Beijing White in China and Malagori of Pakistan, have been prized for sculpture since classical times. This preference has to do with the softness and relative isotropy and homogeneity, and a relative resistance to shattering. Also, the low index of refraction of calcite allows light to penetrate several millimeters into the stone before being scattered out, resulting in the characteristic "waxy" look which gives "life" to marble sculptures of the human body.Construction marbleIn the construction, specifically the dimension stone trade, the term "marble" is used for any crystalline calcitic rock (and some non-calcitic rocks) useful as building stone. For example, "Tennessee marble" is really a dense granular fossiliferous gray to pink to maroon Ordovician limestone that geologists call the Holston Formation.Industrial use of marbleColorless or light-colored marbles are a very pure source of calcium carbonate, which is used in a wide variety of industries. Finely ground marble or calcium carbonate powder is a component in paper, and in consumer products such as toothpaste, plastics, and paints. Ground calcium carbonate can be made from limestone, chalk, and marble; about three-quarters of the ground calcium carbonate worldwide is made from marble. Ground calcium carbonate is used as a coating pigment for paper because of its high brightness and as a paper filler because it strengthens the sheet and imparts high brightness. Ground calcium carbonate is used in consumer products such as a food additive, in toothpaste, and as an inert filler in pills. It is used in plastics because it imparts stiffness, impact strength, dimensional stability, and thermal conductivity. It is used in paints because it is a good filler and extender, has high brightness, and is weather resistant. However, the growth in demand for ground calcium carbonate in the last decade has mostly been for a coating pigment in paper.Calcium carbonate can also be reduced under high heat to calcium oxide (also known as "lime"), which has many applications including being a primary component of many forms of cement.Mississippian marble in Big Cottonwood Canyon, Wasatch Mountains, Utah, USA.ProductionAccording to the United States Geological Survey, U.S. dimension marble production in 2006 was 46,400 tons valued at $18.1 million, compared to 72,300 tons valued at $18.9 million in 2005. Crushed marble production (for aggregate and industrial uses) in 2006 was 11.8 million tons valued at $116 million, of which 6.5 million tons was finely ground calcium carbonate and the rest was construction aggregate. For comparison, 2005 crushed marble production was 7.76 million tons valued at $58.7 million, of which 4.8 million tons was finely ground calcium carbonate and the rest was construction aggregate. U.S. dimension marble demand is about 1.3 million tons. The DSAN World Demand for (finished) Marble Index has shown a growth of 12% annually for the 2000-2006 period, compared to 10.5% annually for the 20002005 period. The largest dimension marble application is tile.Artificial marbleFaux marble or faux marbling is a wall painting technique that imitates the color patterns of real marble (not to be confused with paper marbling). Marble dust can be combined with cement or synthetic resins to make reconstituted or cultured marble.Cultural associationsAs the favorite medium for Greek and Roman sculptors and architects (see classical sculpture), marble has become a cultural symbol of tradition and refined taste. Its extremely varied and colorful patterns make it a favorite decorative material, and it is often imitated in background patterns for computer displays, etc.Places named after the stone include Marblehead, Ohio; Marble Arch, London; the Sea of Marmara; India's Marble Rocks; and the towns of Marble, Minnesota; Marble, Colorado; and Marble Hill, Manhattan, New York. The Elgin Marbles are marble sculptures from the Parthenon that are on display in the British Museum. They were brought to Britain by the Earl of Elgin.See alsocultured marble marble powder with a binder. faux marbling painting surfaces to look like marble. marble sculpture paper marbling Pietre dure inlaying with marble and other stones. scagliola姊歮itating marble with plasterwork. References^ Marmaron, Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus ^ Marmaros, Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus ^ Marble, Compact Oxford English Dictionary ^ Marmair?, Henry George Liddell, Robert Scott, A Greek-English Lexicon, at Perseus External linksWikimedia Commons has media related to: MarbleDimension Stone Statistics and Information - United States Geological Survey minerals information for dimension stone Learning to carve by Marc Levoy. Tips for cleaning marble USGS 2005 Minerals Yearbook: Stone, Crushed USGS 2005 Minerals Yearbook: Stone, Dimension USGS 2006 Minerals Yearbook: Stone, Crushed USGS 2006 Minerals Yearbook: Stone, Dimension Categories: Sculpture materials Metamorphic rocks Limestone Marble Stone Greek loanwords
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