This was because of the brilliant light it gives off when burning in air. In the early years of photography, magnesium was used as a source of light. The only way to deal with a magnesium fire is to smother it under dry sand to break off all contact with the atmosphere. This is because it can burn in nitrogen, water, and carbon dioxide, forming different chemical compounds with all of these. If it starts to burn though, it is very hard to put out. Mg is extremely flammable, but not in large quantities. There is a subsequent release of hydrogen gas. It also reacts with hydrochloric acid and other acids. Its strong reaction with water makes it useful in that it can power a magnesium-based engine. The element is light and silvery-white in color. The majority of magnesium is in the form of the first isotope. Mg has three stable isotopes - 24Mg, 25Mg, and 26Mg. A great deal of them is soluble in water. The compounds of this element usually have the appearance of white crystals. Its reactivity is partly concealed because it is covered with a layer of oxide following production. As a free metal, it burns with a bright white light. Magnesium does not occur naturally as a free element, being extremely reactive. Mg is generated mainly by obtaining magnesium salts from brine and undergoing electrolysis. Magnesite and dolomite are mined, with quantities reaching 10 million tonnes annually, in countries such as Greece, Russia, Austria, Slovakia, North Korea, Turkey, and China. The major world supplier of magnesium is the US, supplying about 45 percent of it globally. It is the 3rd most abundant element in the earth’s crust, after iron and aluminum, and is also found is salty layers, underground brines, and seawater. Magnesium is found in significant quantities in different minerals, such as serpentine, olivine, magnetite, dolomite, and others. Mg is highly soluble in water, which is why it is one of the most abundant elements that can be dissolved. Its abundance is owed to its easy accumulation in supernova stars. It makes up 13 percent of the Earth's mass. It goes by the symbol Mg and is one of the elements that are most frequently found in the Earth's crust, and indeed in the whole universe. Magnesium is a well-known chemical element under number 12 in the periodic table.
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