Color & Veining of Marble

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The color; veining, clouds, mottlings, and shadings in marble are caused by substances included in minor amounts during formation. Iron oxides make the pinks, yellows, browns and reds. Most grays, blue-grays and blacks are of bituminous origin. Greens are caused by micas, chlorites, and silicates. Colors in granite and marble can range from soft beiges  and  pinks and classic black-and-whites to rich corals, greens, and multi colors. Marble traditionally features swirls and "veins" of colors.

Reference: Dimensional Stone Design Manual, Marble Institute of America