Hypertext Webster Gateway: "Argillite"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
argillite
n : a sedimentary rock differing from shale in being bound by
silica and from slate in having no slate cleavages
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