Magnesium Oxide

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 O. It is formed by an ionic bond between one magnesium and one oxygen atom. Magnesium oxide is easily made by burning magnesium ribbon which forms a powder, when magnesium burns it emits a bright white light.
See more at Wikipedia.org...

Noun
1. a white solid mineral that occurs naturally as periclase; a source of magnesium
(synonym) periclase, magnesia
(hypernym) mineral
(substance-meronym) magnesium, Mg, atomic number 12

MAGNESIO OSSIDO LEGGERO. MAGNESIO OSSIDO PESANTE