sedimentary
Anthracite Coal
Anthracite coal (High-rank coal)
Hardness: 2.0-2.5; Color: Black to steel-gray; Luster: Sub-metallic to vitreous; Structure: Amorphous (non-crystalline); Conchoidal fracture; Specific gravity: 1.3-1.8
- Hardness
- 2
- Color
- Black to steel-gray
- Luster
- Sub-metallic to vitreous
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Physical properties
Hardness: 2.0-2.5; Color: Black to steel-gray; Luster: Sub-metallic to vitreous; Structure: Amorphous (non-crystalline); Conchoidal fracture; Specific gravity: 1.3-1.8
Formation & geological history
Formed through the metamorphic heating and compression of peat and lower-grade coal sedimentary deposits over millions of years, typically during the Carboniferous period.
Uses & applications
Primarily used as a high-grade fuel for domestic heating and industrial power generation; also used in water filtration systems and as a filler in steel production.
Geological facts
Anthracite is the highest rank of coal, containing the most carbon and the least impurities. It burns with a blue flame and produces very little smoke compared to bituminous coal.
Field identification & locations
Identified by its jet-black color, metallic shine, and lack of soot residue when handled compared to other coals. Commonly found in folded mountain belts like the Appalachians.
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