Difference Between Calcium and Calcium Carbonate | Compare ...
Nov 25, 2015· Key Difference – Calcium vs. Calcium Carbonate The key difference between Calcium and Calcium Carbonate is that Calcium (Ca) is a pure chemical element and Calcium carbonate (CaCO 3) is Calcium containing compound; it is one of the most abundant natural forms of Calcium found in is an essential mineral for the human body, and it has so many functions.