ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY ADAM HART-DAVIS / SCIENCE PHOTO LIBRARY
Macrophotograph of the surface of a slab of polished marble. This red variety comes from Portugal and is known commercially as Rosso Laverto. Marble is a metamorphic rock composed mainly of calcite (calcium carbonate), but containing minute amounts of various impurities which give it a variety of colours.
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