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Types of Coal

Anthracite
Anthracite

Learn the facts about anthracite coal (a hard coal that's in short supply) from its unique characteristics to its uses in U.S. energy production.

Anthracite: The Highest Rank of Coal
Anthracite: The Highest Rank of Coal

The four ranks are: Anthracite: The highest rank of coal. ... Bituminous: Bituminous coal is a middle rank coal between subbituminous and anthracite. ... Subbituminous: Subbituminous coal is black in color and dull (not shiny), and has a higher heating value than lignite.

source: usgs.gov
Bituminous/Sub Bituminous Coal
Bituminous/Sub Bituminous Coal

Subbituminous coal, also called black lignite, generally dark brown to black coal, intermediate in rank between lignite and bituminous coal according to the coal classification used in the United States and Canada. In many countries subbituminous coal is considered to be a brown coal.

Graphite
Graphite

Graphite is formed in lower crust setting from carbonaceous rocks that might contain coal. Coal is a mixture of organic compounds. Minerals are the inorganic component of coal, referred to as "ash" because it is residual when burning coal (I. E. Fly ash).

source: quora.com
Lignite
Lignite

Lignite, often referred to as brown coal, is a soft, brown, combustible, sedimentary rock formed from naturally compressed peat. It is considered the lowest rank of coal due to its relatively low heat content.

Peat
Peat

At 106 g CO 2 /MJ, the carbon dioxide emission intensity of peat is higher than that of coal (at 94.6 g CO 2 /MJ) and natural gas (at 56.1) (IPCC).

image: pmfias.com
Steam Coal
Steam Coal

…coal is commonly called “steam coal,” and in Germany the term Steinkohle (“rock coal”) is used. In the United States and Canada bituminous coal is divided into high-volatile, medium-volatile, and low-volatile bituminous groups.

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