Magnesium oxide (CAS 1309-48-4)

Magnesium oxide (CAS 1309-48-4)

Magnesium oxide (MgO), or magnesia, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of magnesium (see also oxide). It has an empirical formula of MgO and consists of a lattice of Mg2+ ions and O2− ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + H2O → Mg(OH)2), but it can be reversed by heating it to remove moisture.

Magnesium oxide was historically known as magnesia alba (literally, the white mineral from Magnesia – other sources give magnesia alba as MgCO3), to differentiate it from magnesia negra, a black mineral containing what is now known as manganese.

While “magnesium oxide” normally refers to MgO, magnesium peroxide MgO2 is also known as a compound. According to evolutionary crystal structure prediction, MgO2 is thermodynamically stable at pressures above 116 GPa (gigapascals), and a semiconducting suboxide Mg3O2 is thermodynamically stable above 500 GPa. Because of its stability, MgO is used as a model system for investigating vibrational properties of crystals.

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Product Description


Industries: Glass and ceramics, Pharmaceutical industry, Feed industry, Building chemistry
CAS number: 1309-48-4
WE number: 215-171-9
Chemical formula: MgO
Molar mass: 40,3 g/mol
Customs tariff code: 25199010

Other physical properties
Melting / freezing point: 2800°C
Boiling point / range: 3600°C (1000 hPa)
Relative density: 3,58 g/cm3 (20°C )
Solubility in water: 0,006 g/100 ml (20°C )

Dimensions N/A
Pieejamais apjoms

25 kg bag