Magnesium oxide Magnesium oxide 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 and consists of a lattice of Mg ions and O ions held together by ionic bonding. Magnesium hydroxide forms in the presence of water (MgO + HO → Mg(OH)), but it can be reversed by heating it to separate moisture. Magnesium oxide was historically known as magnesia alba (literally, the white mineral from magnesia – other sources give magnesia alba as MgCO), to differentiate it from "magnesia
Should've Known Better (Richard Marx song) for two weeks and remained on the chart for 13 weeks. Elsewhere, the single reached number 50 in the United Kingdom. Should've Known Better (Richard Marx song) "Should've Known Better" is a hit song written, composed, and performed by American rock singer Richard Marx, who released in September 1987 as the second single from his self-titled debut album. The song peaked at number three on the US "Billboard" Hot 100 as well as #7 on the "Billboard" Mainstream Rock Tracks chart in 1987 and #4 on the Radio & Records CHR/Pop Airplay chart. Marx became the first solo artist in