Calcite crystals. Coloured scanning electron micrograph (SEM) of crystals of calcite (cubes,red) and vaterite (clusters and spheres,yellow),which are both forms of calcium carbonate. The spherical crystals are,in fact,composed of many hexagonal vaterite plates. Calcium carbonate occurs naturally in many rocks,such as limestone and chalk. It has a multitude of different industrial uses and is the most common active ingredient in antacid tablets | |
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Crédit: | Science Photo Library |
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