Magnesium carbonate (MgCO3) is a white, weakly alkaline, inorganic compound containing magnesium. It is stable, non-toxic, tasteless, and non-flammable. It reacts with acids stronger than carbonic acid to produce salts and carbon dioxide, and is slightly soluble in water, acetone, and liquid ammonia. It has water and oil absorption properties, so gymnasts, weightlifters, and climbers often use magnesium carbonate, commonly known as “chalk,” to keep their hands dry. However, magnesium carbonate may cause skin allergies in some people. In addition, magnesium carbonate can also be used as an antacid, laxative, and other gastrointestinal drugs.
