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[ahr-juh-lahyt] /ˈɑr dʒəˌlaɪt/
any compact sedimentary rock composed mainly of clay materials; clay stone.
Origin of argillite
1785-95; < Latin argill(a) argil + -ite1
Related forms
[ahr-juh-lit-ik] /ˌɑr dʒəˈlɪt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for argillite
  • The argillite is marked by few bedding structures and commonly has a near-bedding-parallel cleavage.
  • Each band of chert is separated from the next by layers of argillite.
  • argillite is included with siltstone in the lithology coding.
British Dictionary definitions for argillite


any argillaceous rock, esp a hardened mudstone
Derived Forms
argillitic (ˌɑːdʒɪˈlɪtɪk) adjective
Word Origin
C18: from Latin argilla clay (from Greek argillos) + -ite1
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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argillite in Science
A highly compacted sedimentary or slightly metamorphic rock consisting primarily of particles of clay or silt. Argillite differs from mudstone in that it does not have the same fine laminations, and from shale and slate in that it is not fissile.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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