Definition

Noun: A very white crystalline salt with the chemical formula MgCO₃. It occurs naturally as the mineral magnesite and is also a major component of the mineral dolomite.

Usage

Magnesium carbonate is primarily used as an industrial material and dietary supplement. * It is used as a drying agent, a filler in paints and plastics, and in the production of refractory materials. * In its purified form, it is used as an antacid and a magnesium supplement in medicine, and as an anti-caking agent in food.

Examples

• Industrial: "The factory uses magnesium carbonate as a filler to improve the texture of its plastic products."
• Geological: "The white cliffs in the region are composed largely of magnesium carbonate in the form of magnesite."
• Medical/Consumer: "This tablet contains magnesium carbonate to help relieve indigestion."

Advanced Usage

• In Sports: Magnesium carbonate, often referred to as 'chalk', is used by gymnasts, weightlifters, and climbers to keep their hands dry and improve grip.
  • The rock climber dusted her hands with magnesium carbonate before attempting the difficult route.

Variants and Related Words

• Magnesite (n): The natural mineral form of magnesium carbonate (MgCO₃).
• Dolomite (n): A common rock-forming mineral composed of calcium magnesium carbonate (CaMg(CO₃)₂).

Synonyms

• E504 (n): When used as a food additive, magnesium carbonate is designated by the E number E504.
• Chalk (n, informal): In sporting contexts, magnesium carbonate powder is commonly called chalk (though it is chemically distinct from blackboard chalk, which is calcium carbonate).

Notes on Different Meanings

The term "magnesium carbonate" refers specifically to the chemical compound. Its meaning does not change, but its applications span different fields (geology, industry, medicine, sports).

Noun

1. a very white crystalline salt that occurs naturally as magnesite or as dolomite