http://www.minersmuseum.com/history-of-mining/coal-formation/

There are four stages in coal formation: peat, lignite, bituminous and anthracite. The stage depends upon the conditions to which the plant remains are subjected  ...

https://www.quora.com/What-is-the-process-of-the-formation-of-anthracite-coal

Anthracite Anthracite is the highest rank of coal. It has a carbon content of over 87 % on a dry ash-free basis. Anthracite coal generally has the ...

https://www.britannica.com/science/anthracite

Anthracite: Anthracite, the most highly metamorphosed form of coal. ... to 250 °C ( about 340 to 480 °F) are thought to be necessary for the formation of anthracite.

http://www.coaleducation.org/q&a/how_coal_formed.htm

The environments or conditions under which these coals were formed: anthracite coal, bituminous coal, lignite? Coal formed millions of years ago when the ...

https://en.wikipedia.org/wiki/Anthracite

Anthracite, often referred to as hard coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, ...

https://geology.com/rocks/coal.shtml

Coal-Forming Environments: A generalized diagram of a swamp, showing how water depth, preservation conditions, plant types, and plant productivity can vary  ...

https://csmgeo.csm.jmu.edu/geollab/Fichter/SedRx/Rocks/Coalanth.html

Jul 18, 2000 ... Anthracite coal Go on to: #1 | #2 | #3 | #4 ... Formation & Environments. Anthracite coal forms when bituminous coal undergoes very low grade ...

https://www.sandatlas.org/anthracite/

Pictures, Composition, Geology, Occurrence, and Uses of Anthracite Coal. ... Anthracite. Anthracite is a type of coal with a highest rank. Coal rank measures the carbon content which is in correlation with calorific value ... Banded iron formation

https://www.nationalgeographic.org/encyclopedia/coal/

Dec 22, 2012 ... Fossil fuels are formed from the remains of ancient organisms. .... Because anthracite is a high-quality coal, it burns cleanly, with very little soot.

http://epcamr.org/home/content/reference-materials/coal-types-formation-and-methods-of-mining/

The fourth and final phase results in the formation of anthracite (hard coal). If anthracite coal was placed under more heat and pressure, it would eventually be  ...