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Magnesium: Minerals
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Magnesium is the eighth most abundant element in the earth's crust but does not occur uncombined in nature. It is found in abundance in the minerals brucite, magnesite, dolomite, and carnalite. It is ... found (as the silicate) in asbestos, meerschaum, serpentine, and talc. Magnesium chloride is found in seawater, brines, and salt wells. Mineral waters often contain salts of magnesium; the magnesium ion imparts a bitter flavor. Magnesium is a constituent of the chlorophyll in green plants and is necessary in the diet of animals and humans.
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Magnesium is the eighth most abundant element in the earth's crust. It is found in large deposits of magnesite, dolomite, and other minerals, and in mineral waters, where magnesium ion is soluble. In 1618 a farmer at Epsom in England attempted to give his cows water from a well. This they refused to drink because of the water's bitter taste. However the farmer noticed that the water seemed to heal scratches and rashes. The fame of Epsom salts spread.
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Magnesium appears in the mineral Bensonite. Magnesium, along with iron, is a constituent of the fibrous silicate minerals which were collectively given the commercial name asbestos. Those minerals include tremolite, riebeckite and grunerite. Another fibrous magnesium silicate without iron is chrysotile. Another silicate of magnesium is talc, Mg3Si3O10(OH)3. As the ingredient of baby powders and other talcum products, it certainly has a more benign image than those magnesium silicates which make up asbestos.
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Magnesium develops a corrosion-inhibiting film upon exposure to clean atmospheres and freshwater. However, the film breaks down in the presence of chlorides, sulphates and other media. It is rapidly attacked by mineral acids, except for chromic and hydrofluoric acids. It is ... resistant to dilute alkalies, aliphatic and aromatic hydrocarbons, particular alcohols, and dry bromine, chlorine and fluorine gases. Anodising magnesium improves its corrosion resistance.
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Magnesium is very abundant in nature, occurring in substantial amounts in many rock-forming minerals such as dolomite, magnesite, olivine, and serpentine. In addition, magnesium is ... found in sea water, subterranean brines, and salt beds. It is the third most abundant structural metal in the Earth's crust, exceeded only by aluminum and iron.
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Magnesium is the final member of the big 8 elements in the Earth's crust, being the eighth most abundant element at about 2.1% by weight. Magnesium is contained in the carbonate minerals dolomite, CaMg(CO3)3, magnesite MgCO3 and artenite Mg2CO3(OH)2.3H2O. It appears with iron in the carbonate pyroaurite and in the mineral Hulsite. It appears with boron in the fibrous mineral Szaibelyite. It appears with copper in the carbonate mineral Callaghanite. The compound with boron is called boracite.
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