Cut surface of marble with impurities

Cut surface of marble with impurities

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Credit: GEORGE BERNARD/SCIENCE PHOTO LIBRARY

Caption: Marble. Cut surface of marble, a type of metamor- phic rock derived from limestone. Pure marble con- sists only of the minerals calcite and dolomite, and is white. The colours in this sample are caused by impurities of other minerals. Marble is formed when limestone is subjected to intense heat and pressure, which cause the calcite in the rock to recrystallize into coarse, interlocking grains. The rock can be polished to a smooth, attractive surface and is easily worked. These properties have made marble a highly prized raw material for buildings and statues. Magnification x0.25 at 35mm size.

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Keywords: earth science, geological, geology, marble, metamorphic rock, rock, rocks, type

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