Calcium Carbonate 96.8% Letterbox Friendly - 250gm *Free PP* - Product Code: ECE4466-2X - Pack Size: 250g - HS Code: 3822000090 Description Please note this product is not food grade. Please see GPC2100 for food grade Calcium Carbonate Calcium carbonate is a chemical compound with the formula CaCO3. It is a common substance found in rocks as the minerals calcite and aragonite (most notably as limestone, which is a type of sedimentary rock consisting mainly of calcite) and is the main component of eggs, snail shells, seashells and pearls. Calcium carbonate is the active ingredient in agricultural lime and is created when calcium ions in hard water react with carbonate ions to create limescale. It has medical use as a calcium supplement or as an antacid, but excessive .
eBay