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Calcium Carbonate

[CaCO3] A chemical compound found in nature as calcite (in limestone, marble, and chalk) and aragonite (in pearls) and in plant ashes, bones, and many shells. See Also: Calcite Hardness as Calcium Carbonate Calcite Carbonate Hardness Bicarbonate Hardness Hardness Hardness as Calcium Carbonate Plastic Pipe Total Hardness (TH) Soda Ash Hardness as Calcium Carbonate