About 14% of these are leather auxiliary agents, 14% are electronics chemicals, and 14% are petroleum additives. a wide variety of chemical formula of magnesium carbonate options are available to you, such as coating auxiliary agents, leather auxiliary agents, and water treatment chemicals. Sep 22, 2017u00a0u00b7 here are the explenation of chemical formula and uses of magnesium carbonate this drug is a useful mineral supplement to prevent and treat magnesium deficiency in the blood. magnesium is essential for normal cell, nerve, muscle, bone and heart function. Magnesium carbonate. magnesium carbonate is an inorganic salt with the chemical formula mgco 3. the most general forms of magnesium carbonate are magnesite, the di, tri and pentahydrates. magnesium carbonate is odorless white powder. it has the melting point of 350 degree celsius and all forms of magnesium carbonate reacts with acids.