greywacke

US graywacke

/ (ˈɡreɪˌwækə) /


noun
  1. any dark sandstone or grit having a matrix of clay minerals

Origin of greywacke

1
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

How to use greywacke in a sentence