GEORGE BERNARD / SCIENCE PHOTO LIBRARY GEORGE BERNARD / SCIENCE PHOTO LIBRARY
Marble. Cut surface of marble, a type of metamorphic rock derived from limestone. Pure marble consists only of the minerals calcite and dolomite, and is white. The colours here are caused by impurities of other minerals. Marble is formed when limestone is baked by intense heat and pressure, which cause the minerals in the rock to recrystallize into large, interlocking grains. The rock can be polished to a smooth, shiny surface and is easily worked, making it highly valued both in building and as a raw material for sculpture. This 500 million year old sample is from the Durness Limestone formation in Ledmore, Scotland, UK. Magnification x0.25 at 35mm size.
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