/ (ˈɡreɪˌwækə) /
any dark sandstone or grit having a matrix of clay minerals
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Word Origin for greywacke
C19: partial translation of German Grauwacke; see wacke
Words nearby greywacke
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
Example sentences from the Web for greywacke
In Cornwall and Devonshire, the lead ore is found in veins in killas, a clay-slate passing into greywacke.A Dictionary of Arts, Manufactures and Mines|Andrew Ure