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Natural marble is quarried throughout the world, including in the United States. It is formed primarily of limestone, crystallized over millions of years through extreme heat and pressure. Marble is naturally a light-colored stone, however, it appears in many colors, including black, because of impurities present when the rock formed. Colors that appear in marble's swirls or veins were created by minerals such as silt, sand or iron oxides present during formation. White marble is marble created with few impurities.