Found 2 items, similar to argillite.
English → English (WordNet) Definition: argillite argillite n : a sedimentary rock differing from shale in being bound by silica and from slate in having no slate cleavages
English → English (gcide) Definition: Argillite 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]