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In many varieties of marble the presence of organic remains embedded in the rock adds greatly to its attractiveness. These brilliant colorations are chiefly due to the presence of iron in various combinations dark and grayish shades are generally caused by the presence of a greater or less amount of organic matter. Bright colors-red, yellow, green, and blue-are much rarer than the less brilliant shades, but they are seen in some marbles, and are occasionally so blended and interbanded as to produce extremely beautiful effects. Entirely black marble capable of taking a fine polish is rare much more common are varieties irregularly shaded with gray, bluish-gray, or dove-colored tints. The number and variety of colored and variegated marbles used for various artistic and architectural purposes is very great. These quarries, which have been extensively worked for 2,000 years, furnish, in addition to the white, a large amount of variegated marble, especially of the variety known as bardiglio. From this marble were carved the finest works of Michelangelo. At the present time the artistic world is supplied with statuary-marble from quarries in the Apennine mountains overlooking the Bay of Spezia, and in the vicinity of Carrara, Massa, and Serravezza. The Pentelican marble, obtained from quarries near Athens, stood next to the Parian in ancient times, and its quarries are still apparently inexhaustible. The Parian quarries seem, however, to have been practically exhausted. Among the finest statuary-marbles are those used in the masterpieces of Greek sculpture, of which that from the island of Paros is generally admitted to surpass all others, especially in the possession of a certain amount of translucence by which the artistic effect of the work is heightened.
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White marble such as is used for statuary (for which purpose it must be obtained in large blocks free from flaws or defects of any kind, and perfectly uniform in tint) is extremely rare. Perfectly pure carbonate of lime, dolomitic limestone, and dolomite are all colorless, and white marbles-or at least such as are only slightly tinged with color-are very abundant.
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The value and beauty of marble depend largely on its coloration.
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Thirty-three varieties of ornamental stone are used in the interior of the Grand Opera House in Paris, and a large proportion of these may be classed as marbles. Marble is a material of great importance in architecture, not only for exterior use, but for interior decoration in large, costly monumental structures. The presence of magnesium carbonate associated with the calcium carbonate, forming dolomitic limestone or even pure dolomite, does not in any way influence the nomenclature of the rock indeed, such presence cannot usually be known except from chemical analysis. Any limestone, however, even if very compact or showing only traces of a crystalline structure, may be called marble if it is capable of taking a polish, or if it is suitable or desirable for ornamental and decorative purposes. n marble Limestone in a more or less crystalline or crystalline-granular condition.Most of the gas is captured by the gravitational pull of other celestial bodies.Thanx M.Lerner In fact, it is equivalent to a marble in a box 5 miles wide. There is air in space, but very little of it. t Marble To stain or vein like marble to variegate in color as, to marble the edges of a book, or the surface of paper. Marble Made of, or resembling, marble as, a marble mantel marble paper.Marble Cold hard unfeeling as, a marble breast or heart.Marble A thing made of, or resembling, marble, as a work of art, or record, in marble or, in the plural, a collection of such works as, the Arundel or Arundelian marbles the Elgin marbles.The name is also given to other rocks of like use and appearance, as serpentine or verd antique marble, and less properly to polished porphyry, granite, etc. The color varies from white to black, being sometimes yellow, red, and green, and frequently beautifully veined or clouded. Marble A massive, compact limestone a variety of calcite, capable of being polished and used for architectural and ornamental purposes.Marble A little ball of glass, marble, porcelain, or of some other hard substance, used as a plaything by children or, in the plural, a child's game played with marbles.Ticks can be as small as a grain of rice and grow to be as big as a marble