greywacke

US graywacke

/ (ˈɡreɪˌwækə) /

noun

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
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