Differentiate between “minerals” and “ores”.

Explanation

The naturally occuring chemical substances in form of which the metals occur in the earth along with impurities are called minerals. The mineral from which the metal can be extracted conveniently and economically is called an ore. Thus, all ores are minerals but all minerals are not ores. For example, iron is found in the earth's crust is oxides, carbonates and sulphides. Out of these minerals of iron, the oxides of iron are employed for extraction of the metal. Therefore, oxides of iron are the ores of iron.
Similarly, aluminium occurs in earth's crust in form of two minerals, i.e., bauxine `(Al_2 O_ 3 x H _ 2 O ) ` and clay ` (Al_2O_3. SiO_2. 2 H _2O )`. Out of these two minerals, Al can be conveniently and economically extracted from bauxile. Therefore, bauxine is the ore of aluminium.