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greywacke

[grey-wak, -wak-uh] /ˈgreɪˌwæk, -ˌwæk ə/
noun
1.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for grey-wacke

greywacke

/ˈɡreɪˌwækə/
noun
1.
any dark sandstone or grit having a matrix of clay minerals
Word Origin
C19: partial translation of German Grauwacke; see wacke
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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