| ALUMINIUM ORES* |
N. L. Sharma,
Pages : 125- 141
DOI : 10.1080/0371750X.1946.10877806 |
| Abstract |
| Of all the metallic elements, aluminium is the most
abundant in the earth's crust. The metal is found in
nature not in a free state but in combination, and it constitutes
about 8 per cent of the crust. In terms of oxides,
the percentage of alumina in the earth's crust is about 15;
and alumina together with silica constitutes about 75 % of
th~ crust. The presence of such a large proportion of
aluminium in the crust has been explained as due to its
great affinity for silicon in presence of oxygen, which fact
is evident from the abundance of many aluminium silicate
minerals, like clays, felspars, micas. etc., in the crust. |
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