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.

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Facts from Wikidata (CC0). Image by No machine-readable author provided. Walkerma assumed (based on copyright claims). via Wikimedia Commons (Public domain).

magnesium oxide

chemical compound naturally occurring as periclase

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