Wacke
Usage examples for Wacke:
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A beautiful bust of gray- wacke in our possession probably represents the same king.
"The Complete Historical Romances of Georg Ebers" – Georg Ebers -
The newest of these, connected with the higher series of coal- measures, is well exhibited along the shores of the Forth, in Fifeshire, where they consist of basalt with olivine, amygdaloid, greenstone, wacke and tuff.
"The Student's Elements of Geology" – Sir Charles Lyell