Magnesium carbonate (not to be confused with magnesium citrate) is an inorganic salt that is white in appearance with the chemical symbol mgco3. magnesium carbonate powder is insoluble and does not dissolve in water. because of its insolubility, magnesium carbonate is often used in table salts to prevent clumping. Wholesale magnesium carbonateselect 2020 high quality wholesale magnesium carbonate products in best price from certified chinese magnesium carbonate heavy manufacturers, magnesium carbonate precipitated suppliers, wholesalers and factory on made-in-china Alibaba offers 1,262 magnesium carbonate industrial grade products. about 87% of these are carbonate, 2% are chloride, and 1% are sulphate. a wide variety of magnesium carbonate industrial grade options are available to you, such as industrial grade, food grade. Alibaba offers 2,490 magnesium carbonate industri grade suppliers, and magnesium carbonate industri grade manufacturers, distributors, factories, companies. there are 538 oem, 341 odm, 17 self patent. find high quality magnesium carbonate industri grade suppliers on alibaba.