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

Composition. Carbon, 92–98%. Anthracite, often referred to as hard coal, is a hard, compact variety of coal that has a ...

https://www.purdue.edu/discoverypark/energy/assets/pdfs/cctr/outreach/Basics8-CoalCharacteristics-Oct08.pdf

... called “hard coal,” anthracite forms from bituminous coal when great ... less than 1000 ppm [<0.1% of a rock's composition] of zinc, copper, boron, lead, arsenic ...

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

As plant debris is exposed to the heat and pressure of burial, it changes in composition and properties. The "rank" of a coal is a measure of how much change ...

https://www.thebalance.com/what-is-anthracite-coal-1182544

Learn the facts about anthracite coal—a hard coal in short supply—from its unique characteristics to its uses in U.S. energy production.

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

Anthracite, also called hard coal, the most highly metamorphosed form of coal. It contains more fixed carbon (86 percent or greater on a dry, ash-free basis) than ...

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

Pictures, Composition, Geology, Occurrence, and Uses of Anthracite Coal.

https://www.usgs.gov/faqs/what-are-types-coal

Oct 23, 2017 ... Anthracite: The highest rank of coal. ... black or brownish-black, and has a composition that, including inherent moisture, consists of more than ...

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

Coals are classified into three main ranks, or types: lignite, bituminous coal, and anthracite. These classifications are based on the amount of carbon, oxygen, ...

http://www.kinvestments.eu/offer/anthracite-coal

Anthracite coal is a type of fossil fuel with high percentage of pure carbon (up to 97 ... Depending on type and source, composition may vary in content of quartz, ...

https://www.sciencedirect.com/topics/engineering/anthracite

Anthracite is a high-rank coal, representing a coal that has been subjected to the highest grade of ... Chemical composition: carbon − 77%, ash − 6-16%.