Calcium carbonate. the calcium carbonate project is a planned processing factory project, to be located in the yanbu industrial city, province of madinah, kingdom of saudi arabia. yanbu is in the west of saudi arabia, on the red sea coast, about 400km north of jeddah. Calcium magnesium carbonate, also called dolomite, is a naturally occurring double carbonate consisting of a structural arrangement of calcium carbonate caco3 and magnesium carbonate mgco3. the nodular particle shape of dolomite crystals has similarities to marble ones. therefore, dolomite is often present together with marble. A wide variety of magnesium carbonate options are available to you, such as agriculture grade, industrial grade, and electron grade. there are 13,527 magnesium carbonate suppliers, mainly located in asia. the top supplying countries or regions are united states, china, and india, which supply 1%, 98%, and 1% of magnesium carbonate respectively. What is magnesium carbonate? magnesium carbonate is a mineral that maintains heart, bone, muscle, and nerve health. itu2019s a popular ingredient used as a drying agent in industrial products and cosmetics. h ow to take magnesium carbonate. as a dietary supplement, take 750 mg (just over 1/4 tsp) once or twice per day with water, or as directed by a physician.