Calcium carbonate CaCO3 Usages:Organic compound reaction, manufacture optics neodymium glass.calcium chloride solution. Name:Calcium carbonatePhysicochemical Properties: White powder or ... GradeAssay (CaCO3),% ≥99.9Barium(Ba),% ≤0.008Strontium(Sr) ,% ≤0.008Sodium(Na) ,% ≤0.009Potassium(K) ,% ≤0.001Magnesium(Mg) ,% ≤0.002Aluminum ... content,% ≤0.1HCL Insoluble Matter,% ≤0.005 Calcium carbonate