Search Result for "argillite": 
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;


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]
WordNet (r) 3.0 (2006):

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