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Calcium phosphate Ca3(PO4)2 is found in nature as a rock in Morocco, Israel, Egypt, Kola (Russia) and in smaller quantities in some other countries. The natural form is not completely pure, and there are some other components like sand and lime which can change the composition. In terms of P2O5, most calcium phosphate rocks have a content of 30 % to 40 % P2O5 in weight. Calcium phosphate is a very very important ground product for the production of phosphoric acid and fertilizers. It is also the ground product of the Odda process.
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