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Why do some coals show cleating and some not? Is cleating in coal related to coal's plant source or depositional process or post depositional processes?

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Short answer, its not well studied. It is most likely a diagenic process just because that is the source of most fractures in rock.

https://www.sciencedirect.com/science/article/abs/pii/S0166516297000128

https://www.sciencedirect.com/science/article/pii/S1674775514000341

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