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Aluminum
Aluminum is the most abundant metal making up the more than 7% of the earth's crust. Such common rocks such as granite, containing 14-18% alumina, and clay enriched them up to 20-25%, but getting out of these rocks aluminum metal is hampered by the presence of large amount of silicic acid. The most valuable ores for smelting aluminum are residual products of decomposition of aluminum-containing rocks, from which under the influence of surface weathering in warm climates leached silica and iron oxide and the residue obtained friable earthy rock of white or pink in color, containing 50-60% alumina.
Bauxite deposits are TABULAR sometimes perform caverns in the limestone and are usually located near the primary rocks, of which they formed. The deposits are lenticular and reservoir deposits.
Magnesium.
Deposits of magnesium are divided into two groups: The first group includes the sedimentary deposits of salts occurring in conjunction with potassium salts, and presented layers of the mineral carnallite, from which the extract magnesium metal; The second group includes the deposit of the mineral magnesite (magnesium carbonate), which is mined as a refractory material. Deposits formed by weathering of igneous rocks rich in magnesium (e.g., coils), or through the processing of limestone by hydrothermal solutions rich in magnesium.
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