a poorly sorted sandstone containing fragments of rock and minerals in a clayey matrix.
Compare graywacke.

1795–1805; < German: a kind of stone

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World English Dictionary
wacke (ˈwækə)
obsolete any of various soft earthy rocks that resemble or are derived from basaltic rocks
[C18: from German: rock, gravel, basalt]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

rock resembling sandstone, 1803, from Ger. Wacke, from M.H.G. wacke "a large stone," from O.H.G. wacko "gravel," probably from O.H.G. wegan "to move." A miner's word, brought into geology by Ger. geologist Abraham Gottlob Werner (1750-1817).
Online Etymology Dictionary, © 2010 Douglas Harper
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