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co combustion of coal and sandstone powders

co combustion of coal and sandstone powders

Seen across the northern Great Plains of the US, naturally burning coal-bed fires over time have baked and fused colorful, reddish sediments of clay, shale, and sandstone rocks into clinker, a form of natural brick. Clinker pit south of Rhame, North Dakota. Source: North Dakota Geological Survey.

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