argillite

Noun

WordNet 3.0

Noun (1)

  1. a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages
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Webster's Dictionary (GCIDE)

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]
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