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  1. Pertaining to, largely composed of, or containing clay-size particles or clay minerals, such as an argillaceous ore in which the gangue is mainly clay; esp. said of a sediment (such as marl) or a sedimentary rock (such as shale) containing an appreciable amount of clay. Syn: clayey See also: argillic
  2. Pertaining to argillite. AGI
    Source: Dictionary of Mining, Mineral, and Related Terms

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