Grey wacke

greywacke

[grey-wak, -wak-uh]
noun
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greywacke or (US) graywacke (ˈɡreɪˌwækə)
 
n
any dark sandstone or grit having a matrix of clay minerals
 
[C19: partial translation of German Grauwacke; see wacke]
 
graywacke or (US) graywacke
 
n
 
[C19: partial translation of German Grauwacke; see wacke]

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