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2 definitions found
 for Argillite
From The Collaborative International Dictionary of English v.0.48 :

  Argillite \Ar"gil*lite\, n. [Gr. ? clay + -lite.] (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.
     [1913 Webster]

From WordNet (r) 3.0 (2006) :

      n 1: a sedimentary rock differing from shale in being bound by
           silica and from slate in having no slate cleavages

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