Periclase

n.

1.

(Min.) A grayish or dark green mineral, consisting essentially of magnesia (magnesium oxide), occurring in granular forms or in isometric crystals.

Noun

1.

periclase - a white solid mineral that occurs naturally as periclase; a source of magnesium Synonyms: magnesia, magnesium oxide

atomic number 12, magnesia, magnesium, magnesium oxide, Mg, mineral