Magnesite, with the chemical formula Mg[CO 3] or MgO·CO 2, is a magnesium carbonate with an island structure. In the mineral crystal chemical classification, magnesite belongs to the oxysalt category, the carbonate class, and the calcite group. In the structural-functional classification of mineral raw materials in mineral material science, magnesite belongs to the three-dimensional structural mineral category and the non-functional mineral (chemical mineral) subcategory.