ar·gil·lite /ˈɑrʤəˌlaɪt/
  矽質粘土岩,粘板岩
  Ar·gil·lite n.  Min. Argillaceous schist or slate; clay slate. Its colors is bluish or blackish gray, sometimes greenish gray, brownish red, etc.  -- Ar*gil*lit*ic, a.
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  argillite
       n : a sedimentary rock differing from shale in being bound by
           silica and from slate in having no slate cleavages