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Dolomite rock fracture surface, macrophotograph. This rock was originally a sedimentary limestone, formed from reefs and sediments laid down millions of years ago in a warm tropical sea. Over time, the process of dolomitization exchanges the original limestone calcium ions for magnesium carbonate. This destroys the original sedimentary structures. This specimen is from Schlern, Peitlerkofel, South Tyrol, Italy. Magnification: x2.7 when printed at 10 centimetres across.
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