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wacke

American  
[wak-uh] / ˈwæk ə /

noun

  1. a poorly sorted sandstone containing fragments of rock and minerals in a clayey matrix.


wacke British  
/ ˈwækə /

noun

  1. obsolete any of various soft earthy rocks that resemble or are derived from basaltic rocks

"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

Etymology

Origin of wacke

1795–1805; < German: a kind of stone

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The terms quartz wacke, lithic wacke, and feldspathic wacke are used.

From Textbooks • Jan. 1, 2015

The quartz arenite and arkose have relatively little silt-clay matrix, while the lithic wacke has abundant matrix.

From Textbooks • Jan. 1, 2015

Another name for a lithic wacke is greywacke.

From Textbooks • Jan. 1, 2015

Yet it is by no means apparent that these alone have contributed to form the present surface, the south-eastern side of the field terminating in much older formation of wacke.

From The Highlands of Ethiopia by Harris, William Cornwallis

The rock is very often of a gray color; hence the name, grau, being German for gray, and wacke, being a provincial miner's term.

From Principles of Geology or, The Modern Changes of the Earth and its Inhabitants Considered as Illustrative of Geology by Lyell, Charles, Sir

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