Magnesium carbonate, MgCO₃, is a white solid that occurs in nature as a mineral. Several hydrated and basicforms of magnesium carbonate also exist as minerals. In addition, MgCO₃ has a variety of uses.

Magnesite and dolomite minerals are used to produce magnesium metal and basic refractory bricks. MgCO3 is also used in flooring, fireproofing, fire extinguishing compositions, cosmetics, dusting powder, and toothpaste. Other applications are as filler material, smoke suppressant in plastics, a reinforcing agent in neoprene rubber, a drying agent, a laxative to loosen the bowels, and color retention in foods. In addition, high purity magnesium carbonate is used as antacid and as an additive in table salt to keep it free flowing.

Because of its water-insoluble, hygroscopic properties MgCO3 was first added to salt in 1911 to make the salt flow more freely. The Morton Salt company adopted the slogan “When it rains it pours” in reference to the fact that its MgCO3-containing salt would not stick together in humid weather.[3]

Magnesium carbonate, most often referred to as ‘chalk’, is used as a drying agent for hands in rock climbing, gymnastics, and weight lifting.

Magnesium carbonate is also used in taxidermy for whitening skulls. It can be mixed with hydrogen peroxide to create a paste, which is then spread on the skull to give it a white finish.

Magnesium Carbonate Hydroxide is used as a clay in face masks, it has mild astringent properties and helps to smooth and soften (normal and dry) skin.

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