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It depends, really. A rock's friability is the ability of a rock to easily be broken into smaller pieces(easy in the sense of hitting it with your hand).

Whether or not a rock can burn is based more off of a rock's composition. For example, coal will burn, quartz will not. Rocks made up of organic material(coal, peat, lignite, oil shale) will burn - hence, fuel.

A rock can, though, be organic and friable. So its possible to have a friable rock that can burn. But ignition isn't dependent upon friability.

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15y ago

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