How can you identify Coal?

Compare several properties rather than relying on colour alone. This entry records rock type: Sedimentary Organic; texture: Banded to massive; grain size: Organic no mineral grains; common minerals: Carbon compounds, Pyrite, Clay minerals. Confirm an important identification with additional field tests or qualified laboratory work.

What is Coal commonly confused with?

Coal may be confused with Anthracite, Lignite, Jet. Compare multiple diagnostic properties because colour and surface appearance can overlap.

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Coal identification and geology

Combustible sedimentary rock formed from accumulated plant material. Ranked by carbon content: peat → lignite → bituminous → anthracite. Texture: Banded to massive. Rock type: Sedimentary Organic. Grain size: Organic no mineral grains. Minerals present: Carbon compounds, Pyrite, Clay minerals. Formation: Forms from accumulation and burial of plant material in swamp environments over millions of years coalification . Common geological settings: Worldwide; Appalachian Basin, Ruhr Valley, China, Australia; found in sedimentary basins. Common look-alikes and related entries: Anthracite, Lignite, Jet.

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Anthracite
Lignite

Sources, scope & corrections

These authoritative resources support category-level nomenclature, terminology, identification methods, and safety. When a specimen-specific safety warning appears, the public-health source listed here directly supports that precaution. They are not line-by-line citations for every other property on this entry, and natural specimens vary.

Editorial owner: GeoMiner
Last updated: 2026-03-30T14:38:34.011383+00:00
Review status: Published; not independently peer-reviewed

Rocks — U.S. National Park Service. Authoritative overview of rock groups, the rock cycle, and geologic processes.
Can you identify my rock or mineral? — U.S. Geological Survey. Identification limitations and routes to in-person professional verification.

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Common questions

What is Coal?: Combustible sedimentary rock formed from accumulated plant material. Ranked by carbon content: peat → lignite → bituminous → anthracite.
How can you identify Coal?: Compare several properties rather than relying on colour alone. This entry records rock type: Sedimentary Organic; texture: Banded to massive; grain size: Organic no mineral grains; common minerals: Carbon compounds, Pyrite, Clay minerals. Confirm an important identification with additional field tests or qualified laboratory work.
How does Coal form?: Forms from accumulation and burial of plant material in swamp environments over millions of years coalification .
Where is Coal commonly found?: Worldwide; Appalachian Basin, Ruhr Valley, China, Australia; found in sedimentary basins.
What is Coal commonly confused with?: Coal may be confused with Anthracite, Lignite, Jet. Compare multiple diagnostic properties because colour and surface appearance can overlap.

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Coal identification and geology

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Sources, scope & corrections

Common questions