[grey-wak, -wak-uh]
noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
greywacke or (US) graywacke (ˈɡreɪˌwækə)
any dark sandstone or grit having a matrix of clay minerals
[C19: partial translation of German Grauwacke; see wacke]
graywacke or (US) graywacke
[C19: partial translation of German Grauwacke; see wacke]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The greywacke stone was hauled from nearby quarries.
The main reservoir greywacke is overlain by a heterogeneous mixture of rock types which are normally set behind casing.
The upper unit is mostly slaty mudstone and foliated greywacke.
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