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bituminous coal
coal
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Formation & Environments
anthracite coal forms when bituminous coal undergoes very low grade metamorphism, accompanied by structural deformation. The fixed carbon content under these conditions reaches 85-95%. If anthracite is metamorphosed further it turns into graphite.
Description
Black, shiny, homogeneous, breaking with a conchoidal fracture.
Composition
Partially decayed organic matter
Tectonic Association
None specific |