Magnesium carbonate is an inorganic chemical compound. Its chemical structure has a molecular formula (MgCO3). Its anhydrous form (free from water) is called magnesite also, di, tri, and even pentahydrates having other chemical properties different from each other. Its other names are magnesia alba, Magnesium as well as Carbonate salt. It is soluble in acid (anhydrous). Practically insoluble in ethanol and acetone. It occurs naturally as magnesite minerals thus the main source of elemental magnesium. It reacts with acids. Various base forms of magnesium exist mainly as minerals.