Peat - Precursor of coal
lignite or brown coal - geographically youngest coal, with low carbon content
Sub-bituminous - coal with 35-40% carbon, but also causes low pollution due to low sulphur content
Bituminous - is a dense sedimentary rock, usually black but sometimes dark brown , used in steel plants and electricity production
Steam coal is a grade between bituminous coal and anthracite
anthracite - coal with high carbon content (86% +) ...and is very hard coal
Another form of carbons -
graphite - technically the highest rank in carbon content, is difficult to ignite and is not commonly used as fuel — it is mostly used in pencils and, when powdered, as a lubricant.
diamond -
lignite or brown coal - geographically youngest coal, with low carbon content
Sub-bituminous - coal with 35-40% carbon, but also causes low pollution due to low sulphur content
Bituminous - is a dense sedimentary rock, usually black but sometimes dark brown , used in steel plants and electricity production
Steam coal is a grade between bituminous coal and anthracite
anthracite - coal with high carbon content (86% +) ...and is very hard coal
Another form of carbons -
graphite - technically the highest rank in carbon content, is difficult to ignite and is not commonly used as fuel — it is mostly used in pencils and, when powdered, as a lubricant.
diamond -
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