LYCOS RETRIEVER 
Magnesium: Magnesium Oxide
built 678 days ago
Magnesium is the lightest of the structural metals with a density of only 1.74 g.cm-3. However, magnesium is used as a structural metal in an alloyed form and most magnesium alloys have a density slightly higher than this. Magnesium is a reactive metal and is usually found in nature in the form of and oxide, carbonate or silicate, often in combination with calcium. This reactivity is one of the reasons why the production of magnesium metal requires large amounts of energy.
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Magnesium is a silvery white metal possessing a high lustre. It is malleable and ductile. Sp. gr. 1.75. It preserves its lustre in dry air, but in moist air it becomes tarnished by the formation of a film of oxide. It melts at 632.7° C. (C. T. Heycock and F. H. Neville), and boils at about lioo C. Magnesium and its salts are diamagnetic.
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Magnesium chelated with amino acids is probably the most absorbable form. Less absorbable forms include magnesium bicarbonate, magnesium oxide, and magnesium carbonate. Magnesium oxide is probably somewhat better than magnesium carbonate (dolomite). The newly available salts of magnesium aspartate or citrate, both known as mineral transporters, have a better percentage absorption.
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Magnesium has not been tested, but it’s not suspected of being carcinogenic, mutagenic or teratogenic. Exposure to magnesium oxide fume subsequent to burning, welding or molten metal work can result in metal fume fever with the following temporary symptoms: fever, chills, nausea, vomiting & muscle pain. These usually occur 4-12 hours after exposure & last up to 48 hours. Magnesium oxide fume is a by-product of burning magnesium.
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Magnesium ribbon burns in air with an extremely bright white light, giving off a large amount of energy, and white smoke with is mostly magnesium oxide in very fine particles. The magnesium ribbon easily crumbles into a white powder which is a mixture of magnesium oxide (about 90%) and magnesium nitride (about 10%). since air is a mixture of oxygen and nitrogen gases, both elements react with the magnesium metal.
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Magnesium compounds, primarily magnesium oxide, are used mainly as refractory material in furnace linings for producing iron, steel, nonferrous metals, glass and cement. Magnesium oxide and other compounds ... are used in agricultural, chemical and construction industries. As a metal, this element's principal use is as an alloying additive to aluminium with these aluminium-magnesium alloys being used mainly for beverage cans.
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Magnesium Oxide