Calcium carbonate, ≥% | CaCO3 | SigmaAldrich
General description Calcium carbonate is a calcium salt commonly found in shells and skeleton of marine animals. It is an inexpensive, nontoxic and easily available reagent with a wide range of applications such as uptake of CO 2 and extraction of heavy metals and arsenic from ground water. Its crystals exist as 3 different polymorphs namely, calcite, aragonite, and vaterite.