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magnesium carbonate

1

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.[4]

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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tests	Standard
Description	White fine powder
Identification	Positive
Acid insolubles	0.05% max
Soluble hydrochloride	1.0% max
Assay on Dried basis	40.0-45%
Heavy Metals	0.002% max
Iron	0.04% max
Arsenic	0.0002% max
Calcium Oxide	0.75% max
Colour of solution	B4 max
Chloride	0.07% max

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