Collingwood dolomite is a very pure limestone containing about 60% calcium carbonate and 40% magnesium carbonate and has at least the same liming value as pure calcium carbonate. if the dolomite outcropped over most of new zealand it would be the cheapest material to use to raise soil ph and to cure mg deficiency at the same time. Our products . natural calcium carbonate (gcc) ... dolomite. it is produced from high purity calcium magnesium carbonate marble (metamorphic) . the state-of-the-art ... precipitated calcium carbonate (pcc) also known as purified, refined or synthetic calcium carbonate. it has the same chemical formula as other ... 241 results for magnesium carbonate save magnesium carbonate to get e-mail alerts and updates on your ebay feed. unfollow magnesium carbonate to stop getting updates on u2026 Now calcium magnesium carbonate industry is also spread in middle east and africa (saudi arabia, uae, egypt, nigeria and south africa)and rest of the world. use of advanced technology is constraining the calcium magnesium carbonate global market in north america.