Argillite
Pronunciation : Ar"gil*lite
Part of Speech : n.
Etymology : [Gr. -lite.] (Min.)
Definition : Defn: Argillaceous schist or slate; clay slate. Its colors is bluish or blackish gray, sometimes greenish gray, brownish red, etc. -- Ar`gil*lit"ic, a.
Source : Webster's Unabridged Dictionary, 1913