Changes

* [[Anthracite]] - the cleanest burning coal, found in such regions as south [[Wales]] and northeast [[Pennsylvania]].   

* [[Anthracite]] - the cleanest burning coal, found in such regions as south [[Wales]] and northeast [[Pennsylvania]].   

* Bituminous coal - widely found in [[Appalachia]] and widely used, and does not burn as cleanly as anthracite.

* [[Bituminous coal]] - widely found in [[Appalachia]] and widely used, and does not burn as cleanly as anthracite.

* Sub-bituminous coal - of a lower grade than bituminous and a higher grade than lignite, and is widely mined in the Powder River Basin region of [[Wyoming]].   

* [[Subbituminous coal]] - of a lower grade than bituminous and a higher grade than lignite, and is widely mined in the Powder River Basin region of [[Wyoming]].   

* Lignite - also known as "brown coal", is the dirtiest burning, and is mainly used in power generation.  The top two locations for lignite mining are [[Germany]] and [[Russia]].   

* [[Lignite]] - also known as "brown coal", is the dirtiest burning, and is mainly used in power generation.  The top two locations for lignite mining are [[Germany]] and [[Russia]].   

[[Graphite]], used in [[pencil]]s and as an electrical conductor, is technically a type of coal of an even higher grade than anthracite, but is not used as a fuel as it is hard to ignite.

[[Graphite]], used in [[pencil]]s and as an electrical conductor, is technically a type of coal of an even higher grade than anthracite, but is not used as a fuel as it is hard to ignite.

[[Category:geology]]

[[Category:geology]]

[[Category:Mining]]

[[Category:Mining]]