Define the following terms :
(i) Mineral

(ii) Ore

(iii) Gangue

(i)Mineral: The elements or compounds, which occur naturally in the earth’s crust are known as minerals
(ii)Ore: Minerals from which the metals can be extracted profitably are called ores.

(iii)Gangue: Gangue is the commercially worthless material that surrounds, or is closely mixed with a wanted mineral in an ore deposit such as soil, sand, etc.