sedimentary

Anthracite Coal

Anthracite (Metamorphosed Carbon)

AI-generated identification · may be incorrect

Hardness: 2.5-3.0 Mohs; Color: Jet black to dark grey; Luster: Sub-metallic to vitreous; Structure: Amorphous; Fracture: Conchoidal; Specific Gravity: 1.3-1.8

Hardness: 2
Color: Jet black to dark grey
Luster: Sub-metallic to vitreous

Identified July 2, 2026More sedimentary →

Explore Anthracite Coal in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Hardness: 2.5-3.0 Mohs; Color: Jet black to dark grey; Luster: Sub-metallic to vitreous; Structure: Amorphous; Fracture: Conchoidal; Specific Gravity: 1.3-1.8

Formation & geological history

Formed through the deep burial and extreme pressure/heat application to peat and lignite over millions of years (typically Carboniferous period). It is the highest grade of coal.

Uses & applications

Primarily used for high-efficiency heating and as a chemical feedstock; occasionally used in decorative carvings or jewelry (though less common than Jet).

Geological facts

Anthracite has the highest carbon count (86%-97%) and the fewest impurities of all coal types. It burns with a short, blue, smokeless flame.

Field identification & locations

Identify by its bright metallic luster, deep black color that doesn't rub off on hands easily, and its lightweight feel. Commonly found in Pennsylvania, USA, and parts of China and Russia.