Depending upon the percentage of carbon present four varieties of coal are available :-
i) ANTHRACITE :
a) It is the best quality and contains above ninety percent carbon content .
b) It is hard compact and black in colour .
c) It is found only in Jammu and Kashmir in small quantity .
ii) BITUMINOUS :
a) it is the most widely used variety of coal and contains about 75 - 85 percent carbon content .
b) it's calorific value is very high due to high proportion of carbon and low moisture content .
c) It is mainly used for heating , steam , rising and production of coke .
d) It is mostly found in Jharkhand , Orissa , West Bengal , Chattisgarh and Madhya Pradesh .
iii) LIGNITE :
a) It is also called brown coal . It is of inferior quality . it is friable in nature .
b) It contains more of moisture and less of combustible matter.
c) It is used by railways and tea factories of Assam and West Bengal.
d) It is found in Pallu of Rajasthan ,Neyveli in Tamil Nadu, Lakhimpur in Assam and Riasi in Kashmir.
iv) PEAT:
a) It has very poor carbon content.
b) It is the first stage of transformation of wood to coal.
c) It emits more smoke and leaves a lot of ash after burning.
d) It is found in Jharkhand (Bihar)
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