Abrasive formation

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A rock consisting of small, hard, sharp-cornered, angular fragments, or a rock, the cuttings from which, produced by the action of a drill bit, are hard, sharp-cornered, angular grains, which grind away or abrade the metal on bits and drill-stem equipment at a rapid rate. Syn: abrasive ground Long
Source: Dictionary of Mining, Mineral, and Related Terms

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