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Ingot: 
 
An ingot is a material, usually metal, that is cast into a shape suitable for further processing on metallic and semiconductor materials prepared in bulk form may also be referred to as ingots, particularly when cast by mold based methods.
 
Uses:  
 
Ingots require a second procedure of shaping, such as cold/hot working, cutting or milling to produce a useful final product. Additionally ingots (of less common materials) can be used as currency, or as a currency reserve as with gold bars.
 
Aluminium:  
 
Aluminium (or aluminum) is a chemical element in the boron group with symbol Al and atomic number *3. It is a silvery white, soft, ductile metal. Aluminium is the third most abundant element (after oxygen and silicon), and the most abundant metal, in the Earth's crust. It makes up about 8% by weight of the Earth's solid surface. Aluminium metal is so chemically reactive that native specimens are rare and limited to extreme reducing environments. Instead, it is found combined in over **0 different minerals.[5] The chief ore of aluminium is bauxite.
 
Aluminium is remarkable for the metal's low density and for its ability to resist corrosion due to the phenomenon of passivation. Structural components made from aluminium and its alloys are vital to the aerospace industry and are important in other areas of transportation and structural materials. The most useful compounds of aluminium, at least on a weight basis, are the oxides and sulphates.