Magnesite is a mineral composed primarily of magnesium carbonate (MgCO₃). It typically forms in sedimentary environments and can be found in various colors, including white, gray, and yellow. Magnesite is often used in the production of magnesium oxide, which has applications in refractory materials, agriculture, and the chemical industry. In addition to its industrial uses, magnesite can also be a source of magnesium for dietary supplements. It is mined in several countries, including China, Brazil, and Austria, where it is extracted and processed for various applications.