Anthracite coal: Anthracite is the highest rank of coal. It has a bright luster and breaks with a semi-conchoidal fracture. Texture, Sedimentary Rock, Sedimentary Rocks, Sedimentary, Geology Rocks, Rock Minerals, Rocks And Minerals, Coal Mining, Metamorphic Rocks
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Coal: Anthracite, Bituminous, Coke, Pictures, Formation, Uses

Coal is a biological sedimentary rock that forms from plant debris.

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