sentence: Calcium carbonate is usually the main cause of hard water.
sentences_before: Calcium carbonate' is a chemical compound, with the chemical formula CaCO3. It is a common substance found as rock in all parts of the world, and is the main component of seashells, snails, and eggshell.
sentences_after: It is used as a calcium supplement or as a treatment for antacid, but too much can be bad for your health.
concept_name: calcium carbonate
headings: Calcium carbonate
categories: Minerals Geochemistry Calcium compounds Carbonates