A white, colourless, or grey mineral form of magnesium carbonate, MgCO3, crystallizing in the trigonal system. It is formed as a replacement mineral of magnesium-rich rocks when carbon dioxide is available. Magnesite is mined both as an ore for magnesium and as a source of magnesium carbonate. It occurs in Austria, USA, Greece, Norway, India, Australia, and South Africa.
Subjects: Earth Sciences and Geography — Chemistry.