Magnesite (MgCO₃) is a naturally occurring mineral primarily composed of magnesium carbonate, widely used in the production of refractory materials due to its high melting point, thermal stability, and resistance to chemical attack. After calcination, magnesite transforms into caustic calcined magnesia (CCM) or dead burned magnesia (DBM)—both of which are critical components in high-temperature applications in steel, cement, glass, and non-ferrous metal industries.