In tectonics and especially in the search for ore it is important to distinguish fault breccia from detrital breccia. Where exposures do not reveal the form or geologic relations of the deposit, the fragments themselves may provide the only clues to their origin.Trituration in a fault zone produces cuneiforms with convex faces which meet in wedge-like edges in sharp contrast with rounded edges and irregular or concave faces of water-worn fragments.

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