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Marble, metamorphic rock composed wholly or in large part of calcite or dolomite crystals, the crystalline texture being the result of metamorphism of limestone by heat and pressure. The term marble is loosely applied to any limestone or dolomite that takes a good polish and is otherwise suitable as a building stone or ornamental stone. Marbles range in color from snow-white to gray and black, many varieties being some shade of red, yellow, pink, green. Marble is used as a material in statuary and monuments, as a facing stone in buildings and residences, and for pillars, colonnades, paneling, wainscoting, and floor tiles. Marble was extensively used by the ancient Greeks; the Parthenon and other famous buildings over the world were constructed of white marble. At the moment, quarried from Quy Hop, Thanh Hoa and Yen Bai province, Vietnam marbles are exported strongly to India, Greek, Italy, Turkey, Spain, China, etc.