sedimentary

Likely anthracite coal

Anthracite, a carbon-rich coal (predominantly elemental carbon)

AI-generated identification · may be incorrect

Black, shiny to submetallic surfaces with irregular fracture; hardness about 2–3 Mohs and no crystal cleavage. The image alone cannot confirm composition; the specimen appears coal-like rather than a clearly identifiable mineral crystal.

Identified September 26, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when buried plant-rich peat is progressively heated and compressed during regional metamorphism, producing high-carbon coal. Commonly associated with Paleozoic coal deposits, though age depends on locality.

Uses & applications

Burned as a high-energy fuel and used in some filtration applications; attractive pieces may be kept as educational or mineral-collection specimens.

Geological facts

Anthracite is the highest-rank coal, typically with more fixed carbon and less volatile matter than bituminous coal.

Field identification & locations

Look for a hard, brittle, black fragment with bright luster and relatively clean-burning behavior; major deposits occur in Pennsylvania, China, Russia, and elsewhere. A definitive identification may require a streak, density, and composition test.