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Magnesium oxide (Mg O), 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 Mg 2+ ions and O 2− ions held together by ionic bonding .
Ông Trời is referred to by many names depending on the religious circumstances. In South Vietnam, he is often called Ông Thiên (翁天). In Đạo Mẫu, he is called the Vua Cha Ngọc Hoàng (𢂜吒玉皇, Monarchical Father Ngọc Hoàng), as he is the father of Liễu Hạnh.