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For glass, metal, or ceramic toys, see marbles.

Marble is a 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.

Faux 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.

Places named after the stone include Marble Hill, Manhattan, New York; the Sea of Marmara; India's Marble Rocks; and the towns of Marble, Minnesota; Marble, Colorado; and Marble Arch, London. 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.

Origins

Marble is a metamorphic rock resulting from regional or at times contact metamorphism of sedimentary carbonate rocks, either limestone or dolostone. This metamorphic process causes a complete recrystallization of the original rock into an interlocking mosaic of calcite 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.

Kinds of marble

Some historically important kinds of marble, named after the locations of their quarries, include:

• Paros from (Greece)
• Penteli from (Greece)
• Carrara from (Italy)
• Proconnesus from (Turkey)
• Macael from (Spain)
• Danby from Vermont

White marbles, like Carrara, 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 marble

In the construction trade, the term "marble" is used for any massive, crystalline calcitic rock (and some non-calcitic rocks) useful as building stone. For example, Tennessee Marble is really a massive, highly fossiliferous gray to pink to maroon Ordovician dolostone, known as the Holston Formation by geologists.

Industrial use of marble

Colorless marbles are a very pure source of calcium carbonate, which is used in a wide variety of industries. Finely ground marble powder is a component in paints, toothpaste, plastics, and used in many other trades. The corporation OMYA, with quarries throughout the world, extracts and processes much of the marble used for these purposes.

Etymology

The word "marble" derives from the Greek marmaros, "shining stone" (OED). This stem is also the basis for the English word "marmoreal" meaning "marble-like".

Cultural associations

As the favorite medium for Greek and Roman sculptors and architects, marble has become a cultural symbol of tradition and refined taste. Its extremely varied and colorful patterns make it a favorite decorative material, and are often imitated — e.g. in background patterns for computer displays.

In folklore, marble is associated with the astrological sign of Gemini. Pure white marble is an emblem of purity. It is also an emblem of immortality, and an ensurer of success in education.

See also

• list of minerals
• building material
• limestone
• travertine
• alabaster
• granite
• sandstone

• marble sculpture
• marquetry — inlaying with marble and other stones.
• faux marbling — painting surfaces to look like marble.
• scagliola — imitating marble with plasterwork.
• cultured marble — marble powder with a binder.
• paper marbling

External links

• Tips for cleaning marble MarbleMaster Cleaning and Restoration Advice
• Calcite, Limestone and Marble by Kelly Snyder and Peter Russel.
• Marble Institute of America, a trade organization.
• Geology, types, and history
• Learning to carve by Marc Levoy.

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