Calcium carbonate is a chemical with the formula 《CaCO3.. Calcium carbonate is an exceptional mineral. Calcium carbonate 《CaCo3 شامل contains more than 4% of the Earth’s crust and is found worldwide. Calcium carbonate is one of the most widely used materials known to mankind. This substance can also be produced artificially, and of course it is present in the eggshells and membranes of animals such as snails and crabs. Pearls are also made of calcium carbonate.
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