argillite

American  

[ahr-juh-lahyt] / ˈɑr dʒəˌlaɪt /

noun

1. any compact sedimentary rock composed mainly of clay materials; clay stone.

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argillite British  

/ ˈɑːdʒɪˌlaɪt, ˌɑːdʒɪˈlɪtɪk /

noun

1. any argillaceous rock, esp a hardened mudstone

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argillite Scientific  

/ är′jə-līt′ /

1. 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.

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Other Word Forms

• argillitic adjective

Etymology

Origin of argillite

1785–95; < Latin argill ( a ) argil + -ite ¹

Example Sentences

Winding paths of decomposed granite descend into the garden, where loosely arranged vertical slabs of argillite rock — a “living wall” — create pockets for vegetation to grow and animals to inhabit.

From Los Angeles Times • Feb. 11, 2022

Their Wall Street curled out of sight into a jumbled black terminus of precariously perched argillite boulders and other worthless rock till feeding the McKinley River.

From The Guardian • Nov. 8, 2018

There are three principal groups,—first, the interglacial pal�oliths, secondly, the argillite points and flakes, and thirdly, the arrow-heads, knives, mortars and pestles, axes and hoes, ornamental stones, etc., of Indians of the recent period.

From The Discovery of America Vol. 1 (of 2) with some account of Ancient America and the Spanish Conquest by Fiske, John

Here anthracitiferous coal is found in beds of argillite and sandstone.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" by Various

Near the upper end of the camp, Avalanche Creek has cut a deep, narrow gorge through brilliant red argillite.

From Glacier National Park [Montana] by Interior, United States Dept. of the