Define thefollowing terms.
(i) Mineral (ii) Ore (iii) Gangue
(i) Mineral: Most of theelements occur in nature as in combined state as minerals. Thechemical composition of minerals is fixed.
(ii) Ore: Minerals fromwhich metals can be extracted profitably are known as ores.
(iii) Gangue: The impurities (sand, silt, soil,gravel, etc.) present in the ore are called gangue.