CONTAINING a tarlike substance called bitumen or asphalt.Bituminous coal is of higher quality than LIGNITE and Sub-bituminous coal, but of poorer quality than anthracite.This type of coal (Bituminous coal) is an organic sedimentary rock formed by diagenetic and sub metamorphic compression of peat bog material.The carbon content of bituminous coal is around 45-86 percent, the rest is composed of air, water, hydrogen, and sulfur. Coal is a brownish-black or combustible black sedimentary rock, formed as rock strata called coal seams.Coal is mostly carbon with variable amounts of other elements, chiefly sulfur, hydrogen, OXYGEN, and nitrogen.Jharkhand in India is the largest producer of Coal.India is the 2nd biggest producer of Coal in the world.Chinakuri, West Bengal is the deepest coal mine in India.Lignite:-Lignite is a brown, soft, combustible, sedimentary rock formed from naturally compressed peat.It has a carbon content of around 25 to 35 %.Lignite is considered the lowest rank of coal due to its relatively LOW heat content.Lignite is used almost exclusively as a fuel for steam-electric power generation.Anthracite:-Anthracite is also known as hard coal.Anthracite is a hard, compact variety of coal that has a submetallic luster.Anthracite has the highest carbon content.It is the highest ranking of coals.It is found in India only in JAMMU and Kashmir.