greywacke
US graywacke
/ (ˈɡreɪˌwækə) /
noun
any dark sandstone or grit having a matrix of clay minerals
Origin of greywacke
1C19: 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
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 UreThe date assigned to its upheaval is "after the unfossiliferous greywacke, or Cambrian strata, and before the Silurian."
Principles of Geology | Charles LyellThis fossil-bearing set of strata he first styled the “fossiliferous greywacke series,” changing it in 1835 to “Silurian system.”
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