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'''Magnesium oxide''', or '''magnesia''', is a white solid [[mineral]] that occurs naturally as [[periclase]] and is a source of [[magnesium]]. See also [[oxide]]. It has an [[empirical formula]] of {{Magnesium}}{{Oxygen}}. It is formed by an ionic bond between one magnesium and one oxygen atom. Magnesium oxide is easily made by burning magnesium ribbon which oxidizes in a bright white light, resulting in a powder. It is [[hygroscopic]] in nature and care must be taken to protect it from moisture. [[Magnesium hydroxide]] forms in the presence of water (MgO + H<sub>2</sub>O → Mg(OH)<sub>2</sub>)
The crystal structure of MgO matches the crystal structure of [[NaCl]].<ref>[http://www.webelements.com/webelements/compounds/text/Mg/Mg1O1-1309484.html Chemistry : Periodic Table : magnesium : compound data [magnesium (II) oxide]<!-- Bot generated title -->]</ref>
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* In medicine, magnesium oxide is used for relief for heartburn and sore stomach, as an antacid, magnesium supplement, and as a short-term [[laxative]]. It is also used to improve symptoms of [[indigestion]]. Side effects of magnesium oxide may include nausea and cramping.<ref>[http://www.nlm.nih.gov/medlineplus/druginfo/medmaster/a601074.html MedlinePlus] medicinal use</ref>
* It is used by many libraries for preserving books
* It is used as an insulator in [[Mineral-insulated copper-clad cable|industrial cables]].
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