Alibaba offers 1,382 factory magnesium carbonate products. about 15% of these are carbonate, 8% are weight lifting, and 1% are stabilizers. a wide variety of factory magnesium carbonate options are available to you, such as magnesium carbonate, acidity regulators, and calcium carbonate. China very carbonate, china very carbonate suppliers and manufacturers directorysource a large selection of very carbonate products at sodium carbonate ,sevelamer carbonate manufacturer ,magnesium carbonate from china alibaba Lucky for you, knowing where to do online shopping for top block and the very best deals is dhgate's specialty because we provide you good quality magnesium blocks with good price and service. there is a wide range of block products available online on the platform of dhgate, from sunglasses , fashion accessories of different brands. 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.