bituminous coal

Image credit: James St. John

bituminous coal

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bituminous coal

Image credit: James St. John

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friable - crumbles, pulverizes, or easily scrapes off

Image credit: Scott Brande, CC4.0 License

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bituminous coal hardness between 2 and 2 1/2

Image credit: Scott Brande, CC4.0 License

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